I don't recommend this to people that like to play it safe, but if you want to pull off the best prank ever..
Put Ketchup on a red car!
Imagine the look on the owner's face when they see this! They will wonder:
1. Did a bird poop something red on my car?
2.Where are the fries?
3.What little prankster pulled off this hilarious prank?
Then you can ask them if they can re-enact their reaction while you film it for youtube!
*the Telepath Telegraph is NOT responsible for any reader's ideas, actions,or other delinquent activity involving condiments