"Dinner" joke

A man and a woman were having dinner in a fine restaurant. The waitress,
taking another order at a table a few paces away noticed that the man was
slowly sliding down his chair and under the table, with the woman acting
unconcerned. The waitress watched as the man slid all the way down his
chair and out of sight under the table. Still, the woman dining across from
him appeared calm and unruffled, apparently unaware that her dining
companion had disappeared. 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, "No he didn't.
He just walked in the door."