Instructables
Picture of Make someone smell like sour milk.
This works best on someone who sleeps shirtless/naked

Need:

1. Warm atmosphere (works best)
2. Powdered Milk
3. Unsuspecting victim
 
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Step 1: Set the trap!

 1. Pour a VERY thin coat of powdered milk all over the base sheets. 
     -It should be thin enough that the target can't see the powder.

Step 2: Sleep peacefully!

Picture of Sleep peacefully!
 All you need to do is wait until morning.

Step 3: Smelly!

The person should sweat during the night. If they do, they will be coated with the powdered milk, which will rapidly start to smell funky. 

Congratulations!