I am not sure what a bolo is - is it a hat?
But yes, BPC. I certainly know what you mean about live stage entertainment. Especially "mind readers" - there is almost always some kind of trick t it. - Must be hard when your cellphone internet access is so slow at sea that you can't get the phone numbers in time. Funny!
I was a stage manager and there was a ventriloquist who supposedly drank a glass of water while throwing his voice. While he drank, the dummy's voice was done by his girlfriend with a mic backstage. That's not confined to cruise ships, however. All live entertainment is prone to mishaps - that's what makes it fun, right?