However, you only get charged for gas instead of gas+electric. Thinking that they're on separate billing cycles, you send off the gas bill and ignore it.
Four months go by. You're only paying for gas, but you're obviously getting electric service as well. Do you:
1) Call the company and point out the error?
2) Let it slide: electric is freakin' expensive.
3) Throw lightswitch raves and set your air conditioner on 59.