I need a good prank?

Question

My 12 year old best mates, coming around tomorrow, and I need a good prank to play on her, which my parents can help me with too. I basically wanna scare the freakin' pants off her, Oh, and can it be a prank that doesn't require too much buying stuff.

Oh, and it can be public, like embarrassing her in public would be AWESOME.

Answer 1

get a glass pane and buy a door handle (separate) on the day when she comes in hold the handle next to the glass and then pretend to open the door and then watch her walk into the glass it's quite funny  

Answer 2

One thing I've seen people do is to bake brownies, then while they're still soft shape them into what looks like dog or cat p**p.  Put the p**p-shaped brownies in a (clean) conspicuous place.  Then, when your friend finally says something about it or notices it, pick the p**p-shaped brownie up and eat it.  It freaks people out every time!