Sign Language

Chippie on a 3rd floor of a building site forgot to bring his saw up with him. Shouts down, but apprentice can't hear him. So he does sign language. Points to his eye (I), his knee (need) & moves his hand back and forth in a saw motion. Apprentice nods, pulls down his pants and starts to work.
The furious carpenter runs downstairs, says, "Wtf are you doing? I said I need my saw!" "I know," says apprentice, "Just letting you know I was coming

And the other similar one is:

Builder's mate shouts up to builder and asks "Where's the hammer?" Builder replies by holding his left breast, and then touching his arse. Builder's mate scratches head and asks again, "Where's the hammer?" Again the builder signs by touching his left breast and then his arse. The builder's mate is so confused he hastily climbs up the ladder and says, "I asked you where the hammer was. What was all that gesticulating about?" The builder says, "And I was telling you that I had left it behind!"