A circus owner walked into a bar to see everyone crowded about a table 
watching a little show. On the table was an upside down pot and a duck tap 
dancing on it. The circus owner was so impressed that he offered to buy 
the duck from its owner. After some wheelin' and dealin' they settled for 
$10000 for the duck and the pot. Three days later the circus owner runs 
back to the bar in anger, "Your duck is a ripoff! I put him on the pot 
before a whole audience and he didn't dance a single step!" "So?" asked 
the ducks former owner, "did you remember to light the candle under the 
pot?"