The best is the old truck stop gag:
If everyone (or at least the person sitting in the front passenger seat) is asleep (besides you the driver, of course), pull into a rest stop or truck stop and pull right up to the front of an 18 wheeler.
Put it in park, and then let out a blood curdling scream as if you are about to hit head on.
The guy in the passenger seat will pee his pants every time, guaranteed.
I’m sure most of you have done this. Now that I am 40, not sure if its safe anymore, could cause a heart attack.