Had someone try that once, they had them stored in front of a heater. That is one reason I always feel for dents with my hand prior to ringing any questionable bats. We found one that was HOT, my partner had them hold that bat outside of the dugout and she would let them use it when it cooled down....must have been a favorite bat cause a dad stood out there swinging it to try and speed up cooling it for the next 4-5 innings....I think she let it back in around the 5th inning, I think they learned their lesson on heating bats