Creepy Doll

I am going to give you a seemingly innocuous doll or ventriloquist dummy to keep in your room, then night after night go in and make subtle alterations to its position, then start leaving it in other rooms of the house until you begin seriously questioning whether or not the toy is really alive. You'll start questioning everything. After a while his pleasant expression will seem menacing. Then one day you'll wake up and see it covered in red food coloring and corn syrup--which to you will look a GREAT deal like blood--and pass out with terror.

Belts & Scales

I'm going to replace all the belts in your closets with identical ones in a smaller size so you'll think you've suddenly gained weight.

Towards the same end, I will recalibrate your scale to think that 10lb. is really 0 so when you step on you will think you gained 10 extra pounds.

Earrings

I'm going to give you really large diamond earrings so your earlobes get overextended and become all droopy.

Socks

I'm going to cut holes in the the heels of all of your socks.

Snub

I'm not going to make eye contact with you as I pass you while walking by.

Playdough

I'm going to put playdough in tupperware and put it in your fridge so you'll think I made you some food but when you open it it'll just be playdough.

Heirloom

I'm going to give you a necklace with really weak joints and tell you it's a family heirloom so when it breaks you'll feel really bad.