"I'm Coming!" joke
A worker on a construction site of a high rise building climbed all the way to the top of the building before realizing that he needed a second pair of hands to accomplish the task he had in mind.
Not wanting to climb all the way back down, and also realizing that no one would hear him if he yelled, he signaled to the foreman on the ground.
He pointed first to himself, then his knee, and then the foreman, meaning "I need you."
The foreman waved back and then started acting very strangely.... he unzipped his pants, pulled them down to his ankles, and proceeded to jerk off.
Totally confused and rather alarmed, the worker ran down all fourteen stories of the high rise, staggered over to the foreman and gasped, "What the hell are you doing?
"I got your message," replied the foreman. "I just wanted to let you know that I was coming."
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