My wife and I have this space-age, fancy can opener at home that's supposed to open cans quickly and easily; and it doesn't work at all!  It's been the source of a lot of frustration on burrito nights, believe me!  That's why I'm glad I found this way to open a can with a spoon!

Just make sure you have some pretty strong silverware before you attempt this one.  And be careful of sharp edges!