Taking driver's ed in some converted truck with dark lighting and driving a steering wheel with a film projector guiding us.

Pulling the metal security strips out of the spines of library books and sneaking them into friends' backpacks and clothes. Then waiting and watching the friend try to leave the library - and the alarms going off and the confusion on the part of both the friend and the librarian.

And, of course, stifling the laughs.

IIRC, I think Wuopio was an accomplice with this gag?