Valentine’s Day Cards

Mike walked into a post office just before Valentine’s day, he couldn’t help noticing a middle-aged, balding man standing in a corner sticking “Love” stamps on bright pink envelopes with hearts all over them.  Then the man got out a bottle of Channel perfume from his pocket and started spraying scent over the envelopes.
By now Mike’s curiosity had got the better of him, and so I asked the man why he was sending all those cards.  The man replied, “I’m sending out 500 Valentine cards signed, ‘Guess who?'”
“But why?” asked Mike.
“I’m a divorce lawyer,” the man replied.