Just realized this thread is in
Talk Instruments, so I guess you're looking for intimidating situations in music, my bad.
Last Halloween our band was doing a party gig with some other local bands, we were encouraged to dress up. I had this
weird full face pigeon mask that I had ordered from China. I'm not sure if intimidated is the right word for it, but once we started playing I knew it was going to be a rough ride. Anyone who has worn a full latex mask while playing knows how badly sound is distorted inside the mask, everything rings and just grates your eardrums into a pulp. Combine that with being a little drunk, having not practiced as a unit in two weeks, tripping circuit breakers, and you've got yourself a terribly messy performance. We were all off that night, totally sucked.
Lucky everyone in the crowd was hammered too, they seemed to enjoy it.