Come and go with me (to the SBTB Bermuda triangle)
Slater's sister (all together now: Whaaaaa?) visits from the SBTB Bermuda triangle and drives another wrench in the ever-fading homosexual love affair between Slater and Zack. Belding solves the whole thing by wearing a dead bear on his head.

"Oh give me a school, with a big swimming pool, and LI-brary crammed full of books"
Zack wants to be remembered as more than just a troublemaker, so he sabotages all the other contestants in the school-song competition. Call me crazy, but wouldn't that be the definition of "making trouble"?