April Fool's Day Pranks

When we were growing up my parents were big tricksters on April Fool's Day.  We had to be on guard all day.  You never knew what was coming.  Check out these ideas from Parenting for some family friendly pranks. 

This one would be perfect to do on my son-in-law since I know he has cereal EVERY morning.
Put water in a cereal bowl, and freeze overnight. The next morning, offer to fix Dad or your kids a bowl of cereal. Pour the cereal on top of the ice, completely covering it, and watch them try to dig in.