 Rubber
An old man gets on a crowded bus and no one gives him a seat. As the bus shakes and rattles, the old man's cane slips on the floor and he falls.
As he gets up, a seven year old kid, sitting nearby, turns to him and says, "If you put a little rubber thingy on the end of your stick, you wouldn't have a problem."
The old man snaps back: "Well, if your daddy did the same thing seven years ago, I would have had a seat anyway." | 
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