After ensuring his sister did not devour an evil card and fixing back the skull's gold tooth the best they could, the twins returned to their seats in front of the computer. The two discussed various words to type before finally settling on their most recent discovery, "CARD". Indeed, it offered a different business card with an equal request to eat it.
"Do you think Bill flavors his cards? And do you think it's blackberry or black licorice?"
"I think it's skin and that's exactly why I won't let you lick the first one."
The computer, as if it heard them talking about it, changed its CARD picture to one of a roll of fructose.
"Dipper it does taste sugary! And maybe cherry? No wait, strawberry!"
"Or it's blood. And I'm more concerned the computer answered without us typing first."
"Well the book answers without writing first."
"Right, but I can't say I'm exactly comfortable with a computer gaining the same level of sentience. Remember .GIFfany ?"
"You worry too much Dipper! Bill is a joke now. He can't even use the book with it closed like this," and she knocked on the cover to no effect.
He supposed she was right, but it was another red flag if nothing else. He closed the 2nd CARD image, but the computer offered up nothing. It was the same as before, the cursor flashing waiting for input. Let's see, topics related to Bill. How about…
"GIDEON? Ugh Dipper, why?"
"Shh it's an audio."
The two listened to Gideon humming, Mabel crossing her arms uncomfortably. She scowled at the end when it concluded with "I love you forever, Mabel".
"Happy Dip?," she groaned in disgust.
"Hey I didn't know! It could have been about when Gideon summoned him the first time, or made a deal with him during Weirdmageddon."
Mabel took over the keyboard and quickly typed "WENDY" before Dipper could protest. To Mabel's disappointment and Dipper's relief, it was nothing more than a backup of her short jokey entry in the Book of Bill. Dipper blocked her before she could try Pacifica.
"Knock it off Mabel!"
Mabel huffed, and pretended she relented. When Dipper stopped covering the keyboard and relaxed, she took the immediate opportunity to type "BABBA". When the audio started Dipper froze, flushed in horrified embarrassment while Mabel split into a large grin.
"M-Mabel seriously? We're doing important work here and…how does he even have this?"
"He did snatch your body for an afternoon, he probably took all these memories then."
"W-well this is enough! You had your laugh," Dipper flipped the red switch off and his horror grew when the computer kept playing audio. Now Mabel really was giggling. He tried desperately to switch the dial channel or unplug it from the back, but the computer denied his efforts. Eventually he settled back in his seat and merely buried his face between his arms on the desk instead. The audio played through his entire shower karaoke and Stan's brief interruption before finally ending with a promise for Mabel to never know. When Mabel's snickers died down, she shook his shoulder which he groaned in despair at.
"Aw come on Dipper, it wasn't that bad. Karaoke kills zombies, so it was like practice."
"You got all upset at a 30 second Gideon clip. That's a 3-minute song Mabel. I mean you couldn't have known exactly what would happen but just, leave me alone for a bit," came his muffled reply.
"Fine, I'll get us some snacks while you mope. But I already knew you were my dorky bro-bro, and I won't tell anyone you perform 80s shower karaoke. Not even Candy and Grenda."
She gave a small apologetic hug through the back of his chair, and then left him to his thoughts.