Push a rope?

Requirements

Long piece-o-rope

All of the campers (except the one with the rope) line up in a straight line facing the audience.

Then from off stage, the camper with the rope walks right in front of them pulling the rope behind him.

Well he keeps on doing this, while the campers in the line are looking puzzled and confused, snickering at him and pointing.

Finally after awhile, one of the lined-up campers asks the scout with rope, “Why are you pulling that rope?”

The camper with the rope stops and looks the him and says

“Well have you ever seen a person push a rope before?”