Misunderstanding

From TZ.

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A little fella walks into a bar. Unfortunately there is a pile of dog shit just inside the door, and he slips in it and falls over. He gets up, cleans himself up and walks to the bar and buys a drink.
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A great big man then enters the bar. He slips in the same pile of shit, falls, gets up, cleans up and buys a drink.
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The little guy turns to the big guy and, trying to strike up a conversation, points to the pile by the door and says, "I just did that."
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The big guy punches him in the mouth.