Two fleas stand on the same curb every single
day, and each day they see the same woman walking
her dog. One day the two fleas decide to make a 
bet. 

One flea would jump on the woman, and the other 
would jump on the dog. They would stay there for
a week and after that time would meet back on 
their curb to tell about their experiences. 

A week goes by and the flea that jumped on the 
dog returned to the curb to meet his buddy. The 
other flea never showed up. Days went by before 
the other flea came back. The first flea asked
his buddy what had happened. The second flea 
replied, "I jumped on the woman and found a warm
hairy spot. The next minute, I'm in some 
trucker's mustache on my way to Cleveland."