I don't own Transformers. And I hope I got the characters correct. I also had a bit of trouble with the ending.
Bumblebee grumbled as he cleaned the room. "It's not fair," he said to no one as he scrubbed away at the floor. "How was I supposed to know Prowl would walk in right then. It's not my fault he got in the way and got the stuff all over him."
Sari had introduced him to an Earth substance called 'Silly String'. The two were in a battle with this stuff. Sari was airborne and Bumblebee was trying to get her with some, when Prowl walked in. Bumblebee got the ninja-bot instead. Optimus, who was right behind Prowl, saw the whole thing and luckily didn't get any on him. He ordered Sari to go home and Bumblebee to clean up the room by himself. Prowl left in a huff to go get clean.
Bumblebee looked around at the now clean room and was satisfied that his Saturday wasn't completely wasted. That is until he looked up. The ceiling was covered in the sticky substance. "Aww, how am I supposed to get that stuff?" he complained. Since he didn't have any kind of flight mode, he'd have to find something to help him.
He found something to stand on, but it wasn't tall enough, so he searched for something else to help him. After looking in a few supply closets, he found something that could help. It was a long pole, longer than his height, and had a blunt rectangular shape on the end. "Perfect!" He grabbed a wet towel, wrapped it around the blunt object at the end and tied it off. "With this, I'll have the ceiling clean in no time." Then he got to work cleaning the ceiling.
His towel was dingy and the floor needed to be re-cleaned, but it was working was scraping the last of it off the ceiling, when he heard Ratchet yell, "BUMBLEBEE!" Bumblebee wobbled dramatically, trying not to fall. After a successful attempt at staying upright, he turned to the fuming medic in the doorway.
"Hi, Ratchet, What's wrong?" He asked him.
"What is that you are holding?"
He looked at his new contraption. "Oh, this thing? I found it in the storage closet. It was really handy—"
"That better NOT be The Magnus Hammer."
Bumblebee froze. He thought it looked familiar, but didn't really pay attention. Nervously, he took off the towel, and was confirmed. He indeed was using The Magnus Hammer as a cleaning tool.
Optimus walked in the room to see how Bumblebee was doing with the cleanup, but he found Ratchet finishing the cleanup instead. "Where's Bumblebee?" he asked, "and why isn't he cleaning up this mess?"
"Because, I found him using The Magnus Hammer as a cleaning tool. I've given him a new punishment," he added before Optimus could interrupt. "I've disabled his vocalizer and transforming abilities, rerouted his motor control, and switched him out with Fanzone's car. Maybe tagging along with him, hearing how he hates machines every five minutes would make him think twice about what he did."
Optimus would've said something to Ratchet, but the mech was obviously torqued. He was too that Bumblebee had done something so careless, but figured the best course of action was to leave the medic in this decision. After all, he did promise to watch the item until Ultra Magnus was better. "Just don't leave him out of commission for too long. Oh, and best not to tell Jazz about this."
"Jazz knows. He helped me with the switch. And he's not two happy with the bot now either."
Optimus didn't know Jazz well, but if he was anything like Prowl, he wasn't one to be reckoned with. He left, leaving everyone to their vices.