"Uh." What were they doing? Bart hadn't really been paying attention. He'd been busy scoping out his new lab partner. He could even have gotten up and run in circles around him or gone through his backpack to try to find out more about him, but he was leaning heavily on self-control and had managed to stay firmly rooted in his seat.
"So we're studying like... the physics of roller coasters and how they make them do all that stuff. And at the end of the week we're going to have to make a roller coaster for an egg. The best one- or the one that doesn't kill the egg anyway- wins tickets to The Big Apricot." Realizing that his friend was probably not from Metropolis, Bart added an explanation, "Oh that's the like... local amusement park. It's pretty cool."