Not a sandwich, but I recall, I think it was the in the 50's and I think Triamph, had a problem with a part, that the rules would not alowe them to replace but had to repair. So they put a new part in a bucket of water, the mechanic took the part of the car cursed that it was hot droped in to the bucket of water, and waited a few momments, took out the new part fiddeld with it and put it back on the car. Sneeky or what!