Cute, funny...I likes it!
This is very cute, and the watercolory style makes it look nice. Also, the joke itself is very funny, and provides a good contrast to the kid-friendly appearence of the drawing. My only complaint is that it looks a little empty, as in there's not a lot to it. Sometimes that's a good thing, but here I feel like a little (read: a LITTLE) could have been added without crowding the drawing too much. Other than that, this is great art.