A blonde woman went out to her mail box and looked in it, closed it again, and then went back into her house.

A few minutes
later, she went out and looked in the mail box again, then closed
it and went back inside, once again empty-handed.

After several more trips, a watchful neighbor raking his grass
commented, "You must be expecting a very important letter today!"

"No," the blonde woman answered, looking puzzled, "Actually I am
working on my computer, and it keeps telling me that I have
mail!"