It started right about when I graduated. The bugle rank "flourishes" at the start of the drill had been getting more lengthy and extravagant to the point of being pretentious, and a couple of the CT units in the corps block had their fish start the "ooh" "ahh" thing to mock them in turn. Then more of the CT's joined in.
Well, the naive third deck non reg fish heard that, assumed it was something that was normally done, and within a game or two, a new stupid tradition of appearing to mock the bugle rank at every game was locked in, apparently for all eternity.
The bandsmen who understand its origins still HATE it.