How do you know when your child is watching too much TV?

So we are at Pizza Hut the other day and Rich starts talking about how he is putting on some weight and maybe he should do something about that. My precious 6 1/2 year old looks at Rich, dead serious (and trying to be helpful) and says ..."Try Jenny." I almost peed my pants laughing! And he had no idea why we were laughing- that was the best part of the whole thing. This is how you know that your child watches too much TV.