Why Are You Laughing at THAT?

I must say that Ethan has a weird sense of humor. Today, over at my parents, he couldn't stop laughing. What made him laugh, you ask? Why...it was Grandpa spitting. Yep, don't ask me why, but spit is funny. Many other unique things have made this kid laugh, too. Among them:

*Mark pulling a muscle after laying on the floor for too long and saying, "Ooooh....Daddy got a butt cramp!"
*Mark saying stupid nonsensical words to him, like "Boobbadah!"
*Mark farting, then saying "Daddy farted!" (Ethan only laughs at this sometimes, probably because the smell is so noxious).
*Being startled.
*Playing peek-a-boo, whether intentional or unintentional.
*Anytime ANYONE dances with him.
*Certain songs-"Your Momma Don't Dance," "Refiner's Fire."
*The phrase "cherry pie guy."
*Popping your lips, or using a finger on the inside of your cheek to make a "pop" sound.

All I can say is KIDS....