When you commit a typographical
error, but the
error itself just happens to be another correctly-spelled word that _might_ actually work in the current context, which makes it far more confusing and hard to
spot than if it were just a misspelled word.
Kevin: Hey look, my murder is on the
TV!
Everyone Else (after a
period of confusion): ..... did you maybe
mean "mother"? .....
Kevin: whoops sorry
Everyone Else: Looks like Kevin is Kevining again...