Last year I replaced all the windows in my house whti those expensive double-pane energy-efficient kink. 

Yesterday, I got a call from the contractor who installed them.  He was complaining that the windows had been installed a whole year ago and I hadn't paid for them yet.  heckLOOOO?  Now, just because I'm blonde doesn't mean that I am automatically stupid.  So I told him just exactly what his fast-talking sales guy had told ME last year.  Namely, that in just ONE YEAR, these windows would pay for themselves.

heckLOOOO? (I told him) "It's been a year"!

There was only silence at the other end of the line, so I finally just hung up....
He hasn't called back, probably too embarrassed about forgetting the guarantee they made me.

Bet he won't underestimate a blonde anymore.