It was gamble. The writers were given an ultimatum, and had to decide what was less crazy: the ghostly crocodile-like thing appears on screen and Petrie just goes on doing stuff like nothing happened, or Petrie sings about it. It was either Samuel Beckett or Barney the Dinosaur. I would have prefered Beckett.
Because Walker, the Texas ranger, brought a team of accomplished swimmers to Great Valley School to show them that it's better to a be a "dream maker" (swim) than a "dream breaker" (join Hyp's gang and do drugs). (yeah, I like trashy shows
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If there can't be a drumroll in LBT somewhere, why can't we have a rockroll at least?