Sometimes the simplest pranks are the best ones! They take no time at all, and they're so simple that no one would even expect to look for the obvious. Like this windshield prank. It involves chocolate syrup and a cup of milk.
Simply dump some milk onto the windshield of your victim's car and let it dry. This will make it hard to see out the window, forcing the driver to turn on the windshield wipers. Then, pour chocolate syrup along the windshield wipers and get ready to laugh your ass off. Once you're victim gets in, they'll have to turn on the windshield wipers to clear the window, then— chocolate syrup smear all over! Great! Easy!