I was at a friend's house with the boys for a birthday party. Another lady and her son Spencer were there, and Zack came into the room and dashed for Spencer. The two 4 year-old boys had a great conversation, and while I didn't hear the whole thing I caught this tidbit that made me laugh:
Zack - Guess what? I'm in potty training. I wear underwear all day and all night!
Spencer - I'm not in potty training, I'm in gymnastics!
It's funny that Zack would mention that, considering he's been potty trained for months now, but it was so funny to hear it.