Pranks? I love pranks! This one used to be my favorite. Get yourself a small, used black pickup truck (yeah, it's a little expensive, but well worth the effect). Line the box of the pickup with some heavy-duty plastic tarp of some kind. Then fill the box a little more than halfway full of water. This is where it gets tricky. You must now drive into town without having to come to a stop or even slow down before turning your first corner. The idea is to hunt for pedestrians on the sidewalk who, if in the right place at the right time, will be washed off their feet when you turn that corner and the water sloshes over the side of the pickup box and right into the lower half of their persons. What would be great is if you could do some modifications to convert the sides of the pickup into sidegates so that you can pull a release from inside the cab that will drop the side of the box like a tailgate at just the right moment to send the water at the pedestrians. There's lots of fun to be had if you think outside the pickup box.