Besides all of the stupid stuff I've done as a kid, and am still doing to this day, it has to be my dad whistling and singing to songs; and a lot of the time, he doesn't even know the words, or has never even heard the songs.

That, and how he, many times, makes jokes at my expense when we are around people. Right in front of me, too. I've told him that they are not funny, and that some of them, depending on the joke, do hurt, but he just says that he's just kidding or joking.