This really happened to me, just now. On the side of a busy road, a sign said, "GARAGE SALE. Everything FREE!" with an arrow pointing down a side street into a residential area.
No, the fact that "sale" doesn't match "free" is not the stupidity referred to in the title of this post. I noticed the incongruity right away, but it didn't really bother me. In retrospect, however, it does seem to match what followed. Onward:
I was somewhat busy, but the announced pricing scheme was too tempting to pass up. There was no address on the sign, so as I walked down the street I looked all around for anything resembling a garage or yard sale.
The street curved and ended in a T-intersection. I still saw no sale going on anywhere. And there was no sign about any sale anywhere in sight, either.
And now I'm thinking about people so stupid that they literally have great difficulty giving stuff away. I hope there are people looking out for them who realize how special they are.