Cartoons being cartoons in general. I hate that most kids like to watch "real" kids acting like adults for the most part in underage sitcoms instead of seeing Care Bears staring down the bad guys or watching Smurfs living in it up under the mushrooms.
Above all though NAPTIME - why is it that we hated to stop playin to lay down and when we are adults we'd give our right arm to have an hour or so to catch a little catnap!