The one where Carl decides to start exercising at the precinct again, and he discovers that there is a bomb in his treadmill and if he stops, slows down, or steps off the treadmill, it will explode. Predated Speed by several years.
That episode also involved an orangutan, though I can't remember the context, or if the orangutan story overlapped the bomb story.
EDIT: I almost forgot about my favorite Family Matters episode, where Urkel "accidentally" burns down the diner he works at, and the owner has no insurance so rather than rebuild it he just gives the property to Aunt Rachel, and she opens up Rachel's Place (which is seen throughout the remainder of the series). I always used to speculate that Rachel and Urkel were criminal masterminds and had planned the arson for months, and that Urkel's clumsiness was just a cover for Laura's (and the police's) benefit.