"Husband Under the Table" joke

A man and a beautiful woman were having dinner in a fine restaurant. Their
waitress, taking another order at a table a few steps away, suddenly noticed
that the man was slowly sliding down his chair and under the table, but the
woman acted 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, madam, but I think your husband just slid under
the table."
The woman calmly looked up at her and replied, "No he did not. He just walked in
the door."