I think pretty much everyone will agree with this, but the though of eating school cafeteria pizza again makes me want to hurl. ? It's unbelievable how everyone seemed to love it growing up, but I can't imagine anything from a restaurant (or even frozen) that'd be that bad.
As far as restaurants, probably Sbarro pizza from the mall (if you're old enough to remember them). We usually got it because it was the only option in the Galleria that we'd eat. I miss those old mall days!