One of my friends was dating a blonde girl that wasn't too bright to say
the least.  Often she would come up with the most stupid comments that
at first got us all laughing, but after a while also became a bit
annoying to some. One day we were sitting in a pool hall talking.  The
blonde participated in the discussion, and when she came up with an even
for unusually stupid comment one of my friends couldn't take it anymore.
So he said to her "You must have vacuum in your head". This upset her.
She looked at him for a couple of seconds and replied, "At least it's
better than nothing".