Pete plays some crazy games of football around Warehouse 13. With himself, really.
Added:

Warehouse 13 Season 1 Episode 7 Quotes

Myka: Having intel in the field keeps an agent alive, Pete. But Artie acts like keeping us alive is not a priority. To him we're just...
Pete: Redshirts?
Myka: Yeah.
Pete: Okay. First, he doesn't think we're redshirts. And second, that's so cool you knew what I meant.

Myka: Is there anything you don't play with?
Pete: Umm... no.