John and Mary were having dinner in a very fine restaurant.  Their
 waitress, taking another order at a table a few paces away noticed that
 John was ever so slowly, silently sliding down his chair and under the
 table, while Mary acted quite unconcerned.
 
 Their waitress watched as John slid all the way down his chair and out of
 sight under the table.
 
 Still, Mary appeared calm and unruffled, apparently unaware that John had
 disappeared under the table.
 
 After the waitress finished taking the order, she came over to the table
 and said to the woman, "Pardon me, ma'am, but I think your husband just
 slid under the table."
 
 The woman calmly looked up at her and replied firmly, "Oh, no. He did not.
 In fact, he just walked in the front door."