Mine's really bad. A friend of mine makes me re-tell this story every time I see him.
OK.
It was Christmas. My brother was deeply in love with his new Christian GF and wanted me to meet her. So he brought her along - with her 13-year-old daughter - to what was supposed to be an "elegant" little Christmas drinks party at my house.
Privately, I was a bit stressed and nervous about the party so I'd started early on the mulled wine. When brother, GF and daughter arrived, I was just at the merry stage so made a big fuss of them and then chatted to them all evening, being all lively and nice.
Sadly for everyone, I kept drinking the mulled wine.
10pm, they decide to go home. FOR SOME REASON, as I rocked on my heels, I thought it would be hilarious if I said goodbye in a pretend-nasty way. ???? My reasoning (such as I was capable of) was something like: We had all obviously got on very well, so wouldn't it be funny if I ironically pretended that we hadn't?
So, I turned first to my brother's new, quiet, deeply religious GF and said, with a huge smile, "Well, goodbye then, you f**king bitch."
THEN, I turned to her 13-YEAR-OLD DAUGHTER and thinking it'd be even funnier if I upped the ante on this one "And goodbye to you, you f*king c*t."
Stunned, shocked silence all round, which I only broke by falling over.
It took months of carefully crafted apology emails to even get me nearly out of that one. I still die remembering it.