my wife got furious because I called the dash warning lights 'wife lights'.. after she smoked her second head gasket.
When she asked why, I just smiled sweetly and said, 'just being polite dear, and trying to do my part to promote your precious PC sensibilities.'
she then said 'what ARE you talking about??'
"dear, the little red lights used to be known as (shouted) 'IDIOT LIGHTS'."