For all we know, he went back to school.
4 seconds sound clip from the Ferris Bueller's Day Off movie soundboard.
You can hear this line at 01:00:41 in the Blu-ray version of the movie.
Quote context
[...]
- He's licking the glass, and making obscene gestures with his hands.
- What?
(SLOANE SQUEALING) Don't! Don't.
- He didn't leave. He's probably doing something.
- No, it really busts my hump, you know?
- Oh, Cameron, he didn't ditch us or anything. He's here.
- For all we know, he went back to school.
- He would not go back to school.
- Yeah, he'd do it. He'd just do it just to make me sweat.
[...]