Go to this site by researchers at U. Cal Berkeley and it gives you eight lame jokes to rate. Based on your ratings it gives you jokes optimized to your personal funny bone. But what if the jokes are all stupid? Here is one of them: 

A dog walks into Western Union and asks the clerk to send a telegram. He fills out a form on which he writes down the telegram he wishes to send: "Bow wow wow, bow wow wow."

The clerk says, "You can add another 'Bow wow' for the same price."

The dog responded, "Now wouldn't that sound a little silly?"

The customized jokes aren't much better. Anyway, here is the link:

http://eigentaste.berkeley.edu/user/jokes.php