Did you perhaps get this event: (quote from Event Outcome thread)

Quote:

One Day (name of your GC/villager)was walking on the beach, when he found - half buried in the sand - a mysterious vial filled with what appears to be an oily, red liquid.

Option A:
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Drink the liquid.

Option B:
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Pour it out.

ANSWER:
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A: (name of your GC/villager)drinks the strange liquid in one gulp. Immediately, he feels quite strange. He doesn't quite feel himself. (Click "OK". He turns into someone else)



This would explain the head change.