Singers who forget next line, try to find it in some inner recess of brain, start verse again, long pause, "No, lost it again" Then decides to start at very beginning of song, still loses it. Sings something else instead. All this can take what seems like half an hour. Shanties sung too fast. Shanties sung too slow. Shanties sung with no feeling. Drunks who ask for "That Irish one you do" Audiences that don't wait to hear what chorus YOU are doing, before singing their own. Joining in on last line of verse, rather than on chorus. People who ask what my pet hates are............ I could go on, but I don't want to sound opinionated ;-)