Conan O'Brien asks John C. Reilly if he ever did anything naughty as a kid. "Well, there was this one time..."

Reilly says there was a train yard near his neighborhood where he and his friends would sneak in and lay pennies on the track.

One time they took a rock and broke open a padlock to see what was inside a train car.

It was several hundred boxes of Corn Pops!