Back in 2006, I did a lot of research on old 1940's comic strips. One of them--I think it was Muggs and Skeeter--did an April Fools Day strip about a soccer ball. The joke was that somebody opened the soccer ball, then put a brick inside. Then, they sewed the soccer ball back up, so it looked like a normal soccer ball. Then the person left the soccer ball out in the open, waiting for a unsuspecting victim to come up and try to kick the soccer ball.
It was sort of a complicated and oddly-specific prank, which is why it stuck in my memory.
Recently, I got the 1943-5 collection of Ernie Bushmiller's Nancy comic strip. And for April 1st, 1944, Sluggo plays the exact same trick on Nancy, except he puts the brick inside a top hat, not a soccer ball. (She kicks the brick, and it goes flying in the air, landing on Sluggo's head.)
I figured it wasn't a coincidence that two different comic strips used the same, oddly-specific prank, so I decided to search the Internet. It turns out that hiding a brick under a hat was a rather common April Fools Day prank.
I'm surprised, to be honest. That seems like a rather cruel and extremely painful trick to play on someone. And it doesn't seem like it would be very successful, unless the person you're pranking has a habit of kicking random hats on the street.