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Murphy's Law states that if anything can possibly go wrong, it generally will, causing the maximum frustration and inconvenience. A well known example is that if you drop a slice of toast on the floor, it will nearly always fall butter side down.

Sod's Law is a slightly more extreme formulation of the same phenomenon, stating that if something can go wrong, it will go wrong. Whereas Murphy's law is of US origin, Sod's Law is thought to have originated in the UK, possibly influenced by the generally inclement and miserable weather frequently suffered on this side of the Atlantic.

Whichever of these is more accurate, they constitute absolute proof that we are living in a computer simulation with a bug in the software, since they are in direct contradiction to the laws of probability.