A customer walks into a restaurant and notices a large sign on the wall that says, "$500 if we fail to fill your order."
When his waitress arrives, he orders elephant tail on rye. She calmly writes down his order and walks into the kitchen. Almost immediately the customer hears an explosion of voices from the kitchen. The restaurant owner storms out to the customer's table and slaps down five $100 bills.
"You got me this time, buddy”, he says, "but I want you to know — that's the first time in 10 years we've been out of rye bread."