I have never yet been able to successfully open a can that has a key without incident. I either cut myself, lose the key, get it stuck halfway round, or have the tiny sliver of metal unravel from the key before completion rendering the whole process useless.
C'mon guys - have you not heard of can openers? Cryovac or Vacuum packaging???
Things, people, places, situations etc you hate/loathe/dispise/don't like very much belong in Room 101. If you decide to do the same please comment or link as appropriate as I would love to hear yours too.