You will need the following:
1. A kitten or cat (can be yours or someone elses :)
2. A pussy willow tree (http://en.wikipedia.org/wiki/Pussy_willow)
3. An unsuspecting victim!
4. Some tissue paper.
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Step 1: The Prank
This is an easy one, it's really all in the delivery :)
Step 1. Take one little pussy willow or "catkin" off of the tree and stuff it in some kleenex.
Step 2. Walk non-chalantly up to your unsuspecting victim.
Step 3. Explain in a confused and somewhat upset voice that (insert name of kitten here) was acting all crazy this morning and you saw them pull of one of their toes and that you might need some help to figure out how to get it back on.
Step 4. Take the kleenex out of your hand and hand the little catkin to your unsuspecting victim
Step 5. Watch as they recoil in horror! :D
Step 2: Good Luck!
You can get more than one person with this prank, just make sure they are not within earshot of the first victim :)
Thank you to wikipedia for the images :)