If the sign on the pump said "Buying fuel here means you agree to murder your mother-in-law", I think most courts wouldn't consider that to be entering into a valid contract.

Yes, but (depending on the judge's mother-in-law that has nothing to
do with detrimental reliance. There is another principle wherein a
contract that is impossible, illegal, or dripping with evil would be
null and void. Difficult or mean however would still be upheld. What's
the difference? $300/hr to get a guess.

Jose
--
The price of freedom is... well... freedom.
for Email, make the obvious change in the address.