Repetition makes the heart grow fonder.

Games Will and I have made up with his parents aren't looking:

Put your hand under your jaw, in a fist (a la Rodin's The Thinker). Now, without moving your fist or lower jaw, open your mouth (will necessitate moving the upper part of your head back, sort of like Guy Smilie from Sesame Street). Go "Ya! Ya! Ya!" while doing so. Giggle until you lose breath. Repeat. And then repeat again. And then repeat again.

Put cardstock insert from magazine on top of tennis ball can. Blow card off. Scream with glee. Repeat. And then repeat again. And then repeat again.

Put (teeny wee) hat on Kari's (ginormous, huge) head. "Blow" off (with perhaps, reportedly, assistance from a flinging motion of Kari's hand). Repeat. And then repeat again. And then repeat again.

Help Woody and Buzz perform "I'm a Little Teapot" in basso profundo. Applaud their performance. Repeat. And then repeat again. And then repeat again.

The game that started it all: Put block on head. Tilt head so block falls off. Put block on someone else's head. Laugh with mad insanity when it falls off. Repeat. And then repeat again. And then repeat again.