Your snake, if any, turns pale green and bursts into flames, then you become physically stronger.
The sky is clear and cloudless and then you have an incredible climax repeatedly.
Your head turns golden and screams, then you have an incredible climax.
Your right foot grows an identical one right next to it and then you die instantly for an hour.
You die instantly for a week.
Your right foot turns beige and begins glowing, then you get a free wish.
Your tongue bleeds permanently. Your snake, if any, gains the powers of Mr. Fantastic for the rest of the day.