Man goes into a bar with a grin on his face, and ten pence. The barman says get out people like you are ten a penny.
First define man and bar. when you have defined the need for a man, and hence the worth of monetary compensation for your bar, or why he carries ten pence into a place that you have defined as existing under you contingency a bar. Then define the need for that particular question and why somehow the bar man has bizarrely come to the conclusion he does.
Define the need for jokes, given your conclusions and of course your ability to reason given that you have arbitrarily decided to define existence.