Micah has been testing the limits, as it were, lately. My best example of this is New Year's Eve. He was sitting (wiggling, actually) on my lap while we (the grownups) were playing Catchphrase. (That's a link to the second edition if anyone wants to buy me a "prize". Mom.) I was tickling him along the edge of the back of his sweatpants (teasing him that I was going to get his butt). He said, "MOOOOM! STOOOOOP!" I reached for him one more time, and he swiveled around and pinched me.
On the nipple.
It was hard to know if I should laugh (which I did), yell at him (which I kinda did, except I was laughing too hard), or let it go (which I ultimately did, after admonishing him that "That's not always going to be funny.")