Secret Surfer, that's a great joke!
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A man is jumping on the lid of a manhole repeating "26, 26, 26..." over and over again. A pollock walks up and asks the man what he's doing.
"Why, I'm jumping and saying 26," the man replies. "Want to give it a try?"
The pollock nods, then steps onto the manhole and says "26, 26, 26," as he jumps in place. "Hey, this is pretty fun!" the pollock says. The man then removes the lid from the manhole and tells the pollock to keep jumping. The pollock does so and jumps right in, saying "26" as he falls.
The man slides the lid back in place and begins jumping on the manhole again, saying "27, 27, 27..."