Wow, these are some great stories.
Here's another instant classic...
My son, Zack, was at comp team practice and they were apparently working on a new combo that day. He gets home about the same time I'm cooking dinner. I'm at the stove stirring some sauce when I here "Hey Dad, look what I learned!" I turn around in time to see my son throwing the most beautiful back thrust kick he's ever thrown....right into my groin.
I'm 6'2", about 230 lbs. My son was 12 at the time...maybe about 110 lbs. I went down like a sack of potatoes with nary a wimper (hurt too much to breathe). I evetually gasped out "good one son" from my fetal position on the kitchen floor. The look on his face was priceless. He was simultaneously afraid he'd broken me, and amazed that little 'ole him could do that to big 'ole me.
Peace,
Erik