I've had several. Here's one: My D --who was 9--and I took a cruise to Alaska. When we got on, we noticed that a lot of passengers wore name tags with "X travel." While we waited to check onto the ship, some of them asked if we'd booked through "X travel."
There was a radio preacher on the cruise and about 350 of the 750 passengers were his followers; they had all used the same travel agency. so the name tags were to let them find each other. He was preaching in the towns where the ship stopped. The preacher was allowed a microphone to say grace and make announcements during dinner--usually involving what time the buses to his talks were leaving. The group took over the movie theater for their meetings, etc. At least a dozen of them signed up for the passenger talent show and sang or played hymns and most had no talent.
Many of them were nice people but at least several dozen saw this as their opportunity to proselytize. For example, an elderly couple at our table loved to dance and did it every night before dinner. The second night a group approached them on the dance floor and told them dancing was a sin and they were eternally damned if they didn't give up dancing. If you ordered a drink during a show, someone was sure to tell you that drinking alcohol is immoral. Things got particularly ugly when any of them found out someone was Jewish, as they seemed to think the cruise was a great opportunity to try to convince Jews to "accept Christ as your personal savior." Saying "no, thank you" once didn't work; they just wouldn't give up.
But then the tide sort of turned. The rest of us discovered that the group wouldn't enter the night club. It became the safe place every evening. (In any other public lounge, you were likely to be approached by someone trying to convert you.) Though my daughter was 9 she was allowed in in violation of the normal rules. (She was the only English speaking child who wasn't part of the group.) The entertainers even dedicated songs to her and the passengers were nice about her being there because they understood we didn't want to spend the evening arguing with the preacher's fans. The performers and servers HATED the group because they tried to convert them too and, unlike the rest of us, they couldn't be rude to them or just walk away. And, of course, since they didn't drink, the staff in the bars and at the shows were getting a lot fewer tips.
It was pretty much open warfare between the “saved” and the “sinners.” I’m NOT saying all of them were obnoxious–that wasn’t the case. One young couple was particularly nice to us. But enough of them saw the cruise as as a wonderful chance to evangelize to make life pretty miserable for the rest of us. The upside was the rest of us bonded in a way I’ve never experienced on any other cruise.