(S02E19) You can watch the episode here if you missed it.

I've never really gambled, as that whole concept is a little too complex for me. My brain just isn't wired to keep track of money, statistics, and all those other things needed to gamble successfully.

In Chris' neighborhood, everyone gambles, whether it be on sports or on which kid happens to be your real son. Chris also gets sucked into helping his boss, Doc, bet on sports when it's discovered that Chris knows a lot about the sports teams, even if he himself is a terrible athlete.