Leonard: Can't believe it. Sheldon loves telling on people when they break the rules.
Penny: Yeah, well, maybe he's changed.
Leonard: He hasn't changed. Last week, when the vending machine gave me two bags of chips, he called my mom.
Penny: Well, that didn't ruin your life.
Leonard: Well, it ruined my day. I had to talk to my mom, who, by the way, is-is polyamorous now, so that's fun to think about.