We have a story to tell you:

A lumberjack was busy working in the forest, chopping down trees.  A respsonible lumberjack, he would yell “Timber” each time a tree was felled.  One day he came upon a tree that would not fall, no matter how hard he chopped or how loud he yelled.  After consulting with his fellow lumberjacks, he decided to call a tree doctor.  When the tree doctor examined the tree, his diagnosis was that the tree was deaf and couldn’t hear the signal “Timber.”  The prescription was for the lumberjack to learn the manual alphabet. He mastered the alphabet and fingerspelled T I M B E R to the tree.  Lo and behold, the tree began to fall.

This video tells a similiar story as Timber joke above

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YouTube DirektASL Laught: TIMBER!!!