If you’re really bored this summer, here’s a great way to have a bit of harmless fun; and it will only cost you 25¢. Find a place with lots of people walking by, like near a school or library. Place a little dab of superglue on a coin and stick it to the sidewalk (Gorilla glue or some types of epoxies work well, but use with care as the glues can be toxic and can actually glue your fingers together). Find a hiding spot and watch people try to pick up the coin in vain. If you wish to document your social experiment, use a camera to catch the frustration of your victims. For this and even more practical jokes, see AnnMarie MacKinnon’s Fun with Pranks, Gags, and Jokes, available at amazon.com.