Fox-Gal good idea for a thread! I think if I only have one choice, lying would be what I would say too. There are many reasons why people lie and some of those reasons really irritate me to (cheating on a spouse, as Cookiebaker said, is all about lies.) So many things spring off from lies. I also can't stand to be around boastful people or fake people. I also can't stand to be around people who have had too much to drink or people who use foul language. But all in all, it is lying. If I catch someone in a lie I can never trust them again.