Ow!
I did it by goofing around of course. I was making fun of my buddy because he was choosing to go see "Message in a Bottle" with his wife instead of coming with us for a ski weekend with the boys. He pretended he was going to stab me in the stomach with his keys and my natural instinct was to block open handed to grab his hand. I got his hand alright but he had turned the key upwards so as to not really stab me in the stomach.
I didn't realize I was punctured right through until I was digging my thumb into the exact same place on his hand between the thumb and finger in order to make him drop the keys and then discovered that this was actually hurting me a lot more than I was hurting him.
Pretty funny actually.
