A technician I know and I think Huw also know's him was a chain smoker. The Fuse kept blowing on a heat sealer so instead of investigating the problem further, he used the foil of inside his cigarette box to wrap around the old blow fuse.
A few day's later the unit blew up in smoke unfortuante for the technician they were able to trace back the foil to the particular brand of cigarette he smoked !
