A brunette man had a neighbor who was a blonde. One day while he was mowing his lawn, the blonde walked out of her house, checked her mailbox, slammed it shut, then went inside.

Later that day she did the same thing. She checked her mailbox, slammed it, then went inside. The third time that she did this, he asked her,"what's wrong with your mailbox?" To which the blonde replied," my computer keeps saying that I have mail!"