A guy walks into a post office to see a middle-aged,balding man standing at the counter methodically placing "Love" stamps on bright pink envelopes with hearts all over them. He then takes out a perfume bottle and starts spraying scent on them.
His curiosity getting the better of him, he goes up to the balding man and asks him what he is doing. The man says "I'm a divorce lawyer and I'm sending out 1,000 Valentine cards signed, 'Guess who?'"