Most kids wouldn’t want to endure high school twice, although there are some who would no doubt prefer to remain there forever. Brandon Lee (no, not the late actor son of Bruce Lee) chose a third path by re-enrolling when he was 32 years old and getting away with it, at least for a while. How it all happened is whimsically recounted in My Old School, a clever, amusing and rather slight account of a Scottish misfit’s most irregular education. Or, as Woody Allen used to describe himself, it’s “thin but fun.”