You know what irritates me? Going to the store and seeing a stroller with a 5 year-old in it. The kid can obviously walk but for some reason the parent(s) allow him to be pushed around like a baby.
The only thing worse is if the kid has a pacifier in his/her mouth.
So please, if that's you, stop damaging your child. Take the pacifier, kick him out of the stroller and make him walk like a big boy. In fact, to make up for the years of pampering you should probably make him carry a backpack with a rock in it and occasionaly make him stop and do push-ups.