Prank - Toothpaste on Door Handle

The toothpaste on door handle prank is an old one but a good one.
It works best if u have door handle like this:










It will also work with other doorknobs, but then the toothpaste will be more obvious.
Then, u check if no one is watching.
U grab ur toothpaste, and put it on the door handle.
Put it on the back of the doorhandle, so ur victim won't see it.
It should look like this:









Then wait for ur victim to grab the door handle!
U can also film it, and watch it with ur victim so u can both have a good laugh about it.