The Sheboygan Press reports on a recent showdown at the Sheboygan North High School Homecoming dance.  It seems the jubilant student dancers broke out some moves that strayed a bit too far to the salacious side, prompting Principal Jason “Takes No” Bull to issue this dictum:

[Bull announced] that if inappropriate behavior were to continue, the lights would stay on, the chicken dance song would be played for the rest of the night, and/or the dance would be canceled.

The grim trigger is a strategy in a non-cooperative game, where one party threatens to end cooperation forever if the other party fails to cooperate.  Evidently, it was a credible threat.

Perhaps this helps to explain why.