Not really a "gig" as such, but nonetheless, it was before quite a few people. I wasn't singing, I was give a sermon (years ago, when I was a minister).I was speaking of Samson killing 1000 Philistines with the jaw bone of an ass. But when I said it, it came out "the ass bone of a Jew". A few people giggled but I could not figure out why. I reiterated my point and said it again. More laughter from more people.
To my embarrassment, I actually said it a third time before my own ears caught what I had said. By this time, the whole congregation was ROTFLTAO!
I have made a few spoonerisms while singing, but they do not bother me after the ass I made of myself on the pulpit.
khandu