Head Trip causes Headdy to move incredibly slow and nullifies his ability to jump or attack. If our hero happens to stumble upon this head by accident during a major battle, there's a chance he may take no victory. The head's effects cannot be cancelled, leaving Headdy vulnerable until they expire.
Head Trip resembles the head of Japanese Buddha statues.
In the original Japanese version of the game, the power-up is called "hotoke no kao mo ichido dake heddo" (Japanese: 仏の顔も一度だけヘッド), which may be translated as "The-Buddha's-Face-Only-Once Head."
This is a play on a traditional proverb that reads "hotoke no kao mo sando made" (Japanese: 仏の顔も三度まで), which directly translated means "Buddha's face until the third time." This expresses the fact that even the most patient person will eventually become irritated if provoked enough times.
In other words, it only takes one move for Headdy to face the consequences of disrespecting a Buddha.