Yes, in old fridges it was.
"In the original draft of Back To The Future, Marty McFly worked for Professor Brown, who was a movie bootlegger and the time machine was a laser device that was housed in a room. In the story’s climax, the device was attached to a refrigerator, and taken to the Nevada desert test site for the atomic bomb, where it was strapped into the back of a truck and driven into the atomic explosion in order to harness the power from the nuclear explosion. Marty had to climb into the fridge as the truck barreled towards ground zero.
Why was the idea scrapped? Director Robert Zemeckis has said in interviews that producer Steven Spielberg was afraid that children would start climbing into refrigerators and getting trapped inside, after replicating the scene in the film. Who would have thought that he would have made a film where the hero climbs into a fridge at a nuclear test site almost 25 years later."