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
sorryEveryone Else: Looks like Kevin is Kevining again...