Okay, sorry for the long wait! I had forgotten entirely what I wanted to happen to Sauron, and so I had to come up with some new ideas. Anyway, I don't think the taxi scene is that strong - I've never ridden in a taxi in my life, so if it doesn't hold together, I'm sorry, but it's the best I could do under the circumstances.
Anyway, thank you to the - I assume you were one person? - guest who reviewed. And to answer the question 'What happened to Obliviate?', Voldemort was using non-canon spells that he got on the cheap.
Sauron didn't have the title 'the Deceiver' for nothing. He bent the whole civilisation of Nùmenor to his will, for Eru's sake! He knew how to mask his true self, to put on a semblance of being a pleasant person. He enjoyed doing it, too. It wasn't quite as fun as blasting things apart, or killing things with his armies, but there was a pleasure to be had in watching all those annoying do-gooder Elves and Mortals being fooled by him time and time again.
Unfortunately, he wasn't all that good at it in this annoying place. It hadn't been hard to out on a glamour - Eru, even an Elf could put on a glamour, so he should definitely be able to - so that now he looked exactly like everyone else, even though in reality he was wearing large black armour and carrying a dirty great sword. The problem came in talking to these people. Sauron knew that the way to become powerful was to begin by being close to those in power. At first he had thought it would be very simple. This place had a queen, he just needed to make himself indispensable to her. But then, it turned out that she was really pretty much a figurehead, and it was a council that had the real power. But the problem with that was that it was going to be very, very hard to ingratiate himself into this council. He had none of these stupid papers you seemed to need, for a start. Sauron snorted in anger, and decided the first thing he needed to do was get hold of some of the bits of paper these foolish people used instead of gold. Then he could start judiciously killing people, become ruler, and maybe start a cult or two along the way. It all sounded so easy.
First things first. He approached one of those odd, self driving chariots people were whizzing about in. This one had a yellow bar across its roof with numbers on. He had seen someone get in, one, and it moved off. It all looked deceptively simple.
He opened the door and climbed in. The man sitting behind a wheel looked at him and said "Where d'you want to go?"
Sauron considered this. "I want," He said grandly. "To go to the place where you get pieces of paper."
The man looked at him. "You want to go where?"
"Where you get pieces of paper!" Sauron said angrily. "Are you stupid?"
"You can find yourself a different taxi if you're going to insult me!" The man snapped back.
Sauron felt like splitting the man in half with his sword, but restrained the impulse. It was not conducive to getting where he wanted to go, just now. "I - will not insult you," He said stiffly. He couldn't bring himself to utter any such word as sorry. "Now, will you take me to the place or not?"
"What pieces of paper are you talking about." The man said, with a heavy sigh.
"I don't know what they're called. The bits of paper you use instead of gold."
"At last we're getting somewhere. Which bank?"
Sauron was perplexed. "We were talking about gold," He said. "Not piles of earth."
The man leaned back in his seat. "Look, can you just find someone else. I can't cope with this nonsense anymore."
Sauron but a hand on his hilt. "You will take me to a treasury!" He growled.
"Get out of my car."
Sauron lifted a hand. In his palm he conjured a little flame. The driver stared at it with wide eyes. "Take me to a treasury." Sauron said coldly.
The man gulped, and nodded. "Right, okay, yes." He stammered, and started the car.
Sauron clung to he edges of his seat as the thing lurched forward and began moving with incredible speed. He stared at all the other vehicles milling about at a similar speed, and let out a small sound. He might be a Dark Lord, but this frightened him alright. They all moved so fast, so unpredictably! It astonished him they hadn't crashed already. He squeezed his eyes shut. If he was going to die, he didn't want to see it coming.
Astonishingly, when he felt the car stop and cautiously opened his eyes, he found that they had stopped beside a large building. He wasn't hurt, the car wasn't hurt . . .
He got up and, forgetting the low ceiling, banged his head. "Hobbit hole!" He shouted at the car, then said to the driver "Wait here, I will return."
The man nodded. "I'll do just that."
He got out, rubbing his sore head, then, guessing the big building must be the treasury, he climbed up the steps to enter it. From what little he had gathered of these places, one went in and took money out. Completely insane, but useful. He marched straight past a line of people and said to the person behind the glass pane "I would like some paper gold."
The person who had been talking to her said angrily "Hey, I was here first!"
Sauron ignored him. "I would like some paper gold." He repeated.
"I was dealing with this gentleman here, if you got in the queue then I will deal with you when it's your turn."
Sauron viewed her with undisguised anger. "You will talk to me now!" He said.
"Will you just get out of my way?" The man who had been there before demanded.
Sauron wheeled on him. "Do you know who I am?" He demanded.
"I don't care."
"You are talking to Lord Sauron Gorthaur of Mordor!" He shouted, and struck a pose.
Unfortunately, everyone started laughing. Sauron didn't think he'd said anything funny. He thought he had been threatening them. He growled his anger and stalked away. In the doorway he spotted a large group of people carrying odd metal contraptions, and the man who had driven him here. "That's him!" The man shouted, and everyone levelled their metal things at Sauron. "Stop, you are under arrest!"
"Under a what?" Sauron asked anxiously, glancing up at the roof. No, there didn't seem to be anything about to fall on him.
"Are you trying to be funny?"
"Nothing," Sauron said coldly. "Could be further from my mind."