I just caught up with this thread and I'm really enjoying it! LOL! Here's one I got today in an e-mail -

A blonde replaced all the windows in her house with expensive, double-insulated energy efficient windows. Twelve months later she got a call from the contractor, complaining that the work had been done for a year and she had failed to pay for them. The blonde replied, "Now don't try to pull a fast one on me. Just because I'm blonde doesn't mean that I'm automatically stupid. The salesman who sold me those told me that in one year they would pay for themselves!"