This was a funny sign that I came across with a colleague of mine.
It's a price list for answers.
An answer (presumably incorrect) is 75 cents.
A thoughtful answer (but again incorrect) is 1.25.
A bona fide correct answer is $2.15.
The only thing that's free is getting a dumb look.
I gave the guy $5 and told him to keep the change. ;-)
(Source Photo: Andy Blumenthal)