5) Breaking off the metal tab on a Tuna Can

Pretty straight forward here, but you go to open up a can of tune that has that metal tab that you pull back.  Of course the tab breaks off in your hands. Frantically you look for a can opener and of course you can't find one.  So you stare at the knives in the drawer, thinking to yourself "I think I can pry it open."  2 Band-Aids later you decide to grab the peanut butter out of the cupboard instead.

If I never break off that metal thingie on a can again, I would be a happy man!