20. Tin Openers
If you were to conduct a survey of left handed people and ask them what household item frustrates them the most then the chances are that most of them will mention the tin opener - some lefties simply can't use them at all. Whether or not this is part of some vast conspiracy on the part of right handed people to ensure their own dominance in a post-apocalyptic landscape of tinned food is open to debate (and a rather silly and pointless debate at that) - regardless, lefties remain at a distinct advantage, particularly when going up against a righty in a speed cooking competition.