Peter's hair during a certain point....
I don't remember which season~s~ it was but when Peter's hair gets really straight on the sides and back and is really curly and BIG at the ends....Am I the only one who thought his hair style was going to flat out turn into Eunice Higgins's hair style from the Carol Burnett Show?! lol :)
I think Greg and Bobby went through that type of hair phase too, but not to the extent Peter did.