Hey, I did this thing with my first son when he was a year-and-half, the week before our big family get together for Christmas. I fooled him into thinking that each time he squeezed his face that it made me fart. And it worked! That Christmas day he was showing everyone, fricking hilarious. Finally, I ran out of gas! He came into the room that I was in squeezing his face to show his aunt Dawn how it worked. I couldn't do it, he was puzzled. It looked like he was thinking, then all of a sudden he went behind me and hit me in the ass. Like you say dad, wack it, if that don't work, its broken!