I haven't hurt anyone, but my 3 (then... now 4) year old daughter has -- me.
The kids woke up Easter morning to find that the Easter Bunny didn't bring much chocolate, but Hii did bring a Wii.
We were playing bowling and it was my daughter's turn. Now we all know that the proper form is as follows:
1. Press the B button
2. Raise the Wiimote to a vertical position
3. Swing the Wiimote backwards behind you while taking a step to two forwards like in real bowling
4. Swing the Wiimote forwards and release the B button when you want to release the ball.
This is all fine and dandy. Remember that little 3 year old? Remember how uncoordinated some can be? Well this is her routine when bowling:
1. Stand at least 8 feet away from the TV (we put a tea towel where she's supposed to start from)
2. Press the B button
3. Raise the Wiimote to a vertical position
4. Swing the Wiimote backwards behind you (she doesn't take any steps forward)
5. Swing the Wiimote (and herself) forwards with MUCH force and release the B button (imagine holding one of those hammer throw hammers from track and field and imagine yourself bowling with that as the Wiimote)
Sounds a bit funny... yes?? Well, imagine my 3 year old (very short & petite 3'2" & 32lbs) bowling (at stage 5 where she's catapulting herself across the room -- remember the teatowel at 8ft from the tv?). Now imagine me (Dad - 6'6" & 230lbs) talking with my wife and not really paying attention to what my 3 year old is doing while getting off the couch and getting a Wiimote square in the crotch

(sounds better with another word).
I drop to the floor grabbing my manhood in agony and my daughter stands over me and says: "Daddy, I'm trying to bowl here!"

Meanwhile, my wife has almost pee'd herself she's laughing so hard.
MORAL OF THE STORY: When your 3year old is bowling, stay out of the line of fire.