hanging offense
A crime, misdeed, or impropriety that is (hyperbolically) perceived to warrant death by hanging. Primarily heard in US. Political correctness has become so authoritarian these days that saying anything with even the slightest derogatory implication is seen as a hanging offense!
take offence (at something)
To be or feel insulted, offended, or humiliated by something. Primarily heard in UK. I know your jokes were made completely in jest, but I couldn't help taking offence at them. I noticed your parents leaving in a bit of a huff earlier; I do hope they haven't taken offence.