If you were to make one prank video, which Idea comes first in your mind?

Prank videos are becoming viral and we get to see many such videos these days. They are basically for fun only but we do get to see some which cross the boundaries in different ways. If I ask you to make one prank video, which is funny but decent and logical, what would be the idea that comes first in your mind?
Please share a unique idea or theme on which a prank video, which no one has tried till date, and can be made.