like when i say "hey, say 'fire truck'!" and she responds with "aaah, fuck!"
gets me every time.
or when she hears the clock go off every 30 minutes or an hour, points, and says "cock!" the 8-year-old boy in me giggles his fool head off. even funnier when she puts the word "big" in front of it. tee hee.
and here's a more family-friendly, g-rated trick of late (if you have about 29 seconds to spare):
ah, i love it.