On one of the many TV ads for the dating website Christianmingle.com there is a brief tickle scene m/f with a ticklish reaction...a woman is lying on the floor with her head on a man's chest, and she suddenly jolts upward a little bit and gives a cute smile. It is definitely a ticklish reaction, so even though you can't see it, I'm guessing the guy must have given her a brief tickle on her ribs. If you blink, you'll miss it!