but if that ever happens with a fuse in your home, PLEASE PLEASE don't short it out with a penny (or whatever) or the whole thing may burn down!

I remember seeing a sheet with fuse current ratings for common house hold things in the Electrical Engineering Dept at the Uni at home - hair clips, M12 Bolts, you name it

Don't worry it WAS a joke I think they had the bolt rated at around 600A ...
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)