- Captain Obvious Reveal: Dexter Thornhill, Steve's rival and the only antagonistic character in the episode, is the culprit behind the explosion. We all knew it was him before the opening credits, but the episode still treats it like a big reveal. The explosion happens in the scene directly after Steve outmatches him in physics trivia and Dexter Thornhill told Steve Urkel he looks forward to seeing him have a fall from grace.
http://tvtropes.org/pmwiki/pmwiki.php/YMMV/FamilyMattersS5E16PresumedUrkel
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