I know how NOT to use a P-38...

1) They are not good fuse replacements
2) They are no substitute for a bladed implement
3) Should never ever be used to clean under fingernails
4) Should never be worn alongside dogtags, even when covered with heat shrink; I have an interesting scar.
5) They are not a miniature prybar

All that being said, they WILL open a can. Never got it down to 38 motions, and a regular manual can opener is more efficient. I do carry one in my EDC, but will reach for can opener blade of SAK first (too many bad memories smile
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein