A Pirates fan was willing to trade away his little sister for foul balls

Getting a foul ball at a baseball game is one of the greatest things in the world. We can all agree on that. But just how far would you be willing to go to get one? What would you give up? Who would you give up?
Well, a fan watching the Mariners' 7-4 win over the Pirates on Tuesday, was willing to trade away a member of his family for souvenir glory -- and she was not pleased:

If you click the main video above, you can see the sister laughing about the joke at the end of the clip (at least, we hope they're joking ... THEY'RE JOKING, RIGHT?).