A little dribble that just popped into my mind. I mean, let's face it, this is 100% Dipper right here XD.

Dipper looked at the clock anxiously. Every fiber in his being was jumpy, ready to explode. Mabel came bounding down the stairs and stopped at the front door, checking herself. She was wearing a pink dress with sequins covering it. Dipper looked at the door suspiciously and patted the journal still kept in his pocket. Mabel opened the door, and it took everything Dipper had not to attack.

"Hey, Caleb," Mabel smiled.

Caleb smiled back and crossed the threshold of the Mystery Shack. He was wearing a gray shirt and black pants. Who takes that out to a first date? Dipper's eyes narrowed, but he didn't say anything. Ever since he had convinced his Ford to offer his apprenticeship to Mabel too, his parents had allowed them one year in Gravity Falls. Just to see how it all went. Dipper scanned Caleb quizzically and crossed his arms. Mabel turned to face him, and his smile broadened.

"I'm just going to get some Pitt colas, you want some?"

Dipper nodded, and she bounded out of the room. The minute she was out, he whipped towards Caleb.

"Hurt my sister and I break you."

"Whoa, what's up with you? Take it easy there, Little Dipper."

Mabel was taking the sodas out of the fridge when Ford walked in. He looked at Mabel and rose an eyebrow.

"Where's Dipper?"

"With Caleb."

Ford's eyes widened. Mabel tilted her head in confusion.

"Mabel!" Caleb suddenly screamed.

She ran from the kitchen to see Dipper reading from his journal. His eyes were glowing blue and Caleb was levitating, surrounded by the same blue light. Dipper spoke some unknown language and looked at the boy as a trickle of sweat poured from Caleb's forehead.

"What are you? A vampire? Some kind of ghost? Speak!"

"Um, Dipper? What are you doing?"

Her brother whirled around in surprise. He smiled innocently, flicking his wrist behind his back. Caleb yelped as the motion threw him to the side. Dipper scratched his head.

"He's a vampire."

Mabel gave him a look.

"Bill made me do it?"

The look hardened.

"Secretly, he's a criminal who's robbed at least ten banks and has another heist in mind?"

Mabel groaned and rolled her eyes.

"Dipper! It was fine for the summer, but seriously? If I've told you once, I've told you a million times! DON'T PERFORM EXORCISMS ON MY DATES!"

He glanced over at Caleb, who was slowly getting up. Shaking his head slightly, he held out his hand for Mabel warily.

"Were we going to do something?"

She gently took his hand and gently led him to the front door.

"Yeah, we were on our way to the movies."

He paused.

"Mabel, I... don't think this will work out."

"What? Is this because of my brother? I promise he won't try to banish you to another dimension!"

"Well... it's not that. I'm um... I'm actually a vampire." He said, flashing his fangs.

"YES! I KNEW IT! TAKE THAT!" Dipper suddenly held up his journal, "I WILL DESTROY YOU, YOU BLOOD-SUCKING DEMON!"

Caleb ran as Dipper began chasing him. Mabel gasped and went after the two of them, flailing her arms.

"Dipper! Wait! I've always wanted a vampire boyfriend! Don't deny me this!"

Ford chuckled. Stan walked down the stairs and stared at the running kids.

"Yeesh, what's their deal?"

"Remember when I used to chase Carla around, saying that she was a banshee?"

Stan nodded uneasily. Ford smirked.

"I don't care what the 'evidence proves'. I was still right."