We tend to be pretty discreet, and our fetishes aren't that daring or unusual, so I'd say we manage to being unexposed for 'gone wrong moments', most of the time.
But they inevitably occur, which is to be expected for a couple who venture out but still want to remain married, together and living discreetly.
An occasion that bothered me a lot, and turned somewhat out of our control, occurred when we went on a short trip and there we would meet a friend who already shared our intimacy and sex with my wife. We were hoping to walk around a bit and then we would meet him for some sexy time all three of us.
Everything went more or less as expected and was just fine, and when we followed the three of us to the hotel, only there he finally let us know the fact he also had brought another person, a particular friend of his. A guy we didn't even know!
He showed up with the guy at the very door of our room and, to maintain our friendship in good terms, we let the guy in and it was clear the unannounced guest already knew everything about us and the sexual games we had with my wife. And that wasn't pleasant, it was just embarrassing and irritating.
My wife is horny and likes naughty roleplays, but she is also shy and afraid during those situations, so the four of us were stuck and then upset, when our "friend" and his partner began to suggest the "start" of the orgy.
Of course there was no orgy at all, as we didn't even know about the other guy, and neither I nor my wife were excited by omitted situations like that.
The next day we then met alone with our 'friend'. And finally just the three of us, but it was the last time we spent in his company. My wife didn't bothered and even liked it, however, I thought he fucked her in a very naughty, but strange way... showing a certain contempt or disrespect for us, unlike previous occasions. Maybe upset about not being able to get your colleague into the party.
That was a downer for us. Since we are into kinky stuff, but not disrespect and loss of control.