My father was a Lutheran preacher so I grew up in the church, went every damn week.
Besides learning to hate church, I also learned to dissociate pretty well, without knowing it at the time.
At some point in my teenage years, I started becoming aware that I would be aware of the hymn I was singing for like the 1st verse, but then it would be 4 verses later and I would become aware of my surroundings again and think: what the hell was singing? I'd look around to see if anybody was looking at me wierd, and they weren't, so I assume I was singing something that at least resembled the hymn.
I work in an office and have to attend several Dilbertesque meetings every week, so the ability to dissociate comes in handy sometimes.