10 Ways to Annoy Severus Snape
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Slip an "Erection Enabler" potion into Snape's satchel and then, right in the middle of a staff meeting, charm the bag so it rips and the entire staff finds out about Snape's little...problem.
Post him James and Lily pictures, videos, items, etc.
Make him watch A Very Potter Musical.
Ask, "What the devil is going on here?"
Charm his clothes so they turn pink but everyone can see it except him
Tell him McGonagall was always a better teacher then him even as a cat.
FORCE him to watch the Teletubbies three-hour marathon!
Use Polyjuice Potion to turn into Lily. Slap him and say that you liked James better.
If you're feeling really evil, tell him you liked Dumbledore better than either of them.
Dye his hair so it has pink stripes that can't be removed.