didn't happen in the studio, but did happen while multitack recording...
so, i get asked to make a live recording in a VERY noisy jazz club/restaurant. had been there a few times to watch some friends and i'd say the noise floor hovered around 95dB in the place. really f'n loud euro-money college hang in the boston area. no one really listend to the GREAT playing that was going on there, they just like to be seen there.
on the phone, i say to the owner (who called me to do the job), "this should be fun. the playing is spectacular and you have a loud place. it will be sorta cool to capture the atmosphere of it all in the recording." he says, "yeah, exactly--that's the idea." he hires me to record 7 nights, all three sets per night and then pick the best material to mix to be put onto a very long CD. he's not sure he'll even release it, but has money and likes to spend it and i bet he's love to play it for his friends.
he finally shows up to see what i'm up to recording the thing on night 6, asks to listen to some of it. i hand him the headphones and explain "it's not mixed, these are the raw tracks from the last set." not sure he gets that but...
i kid you not, he says (with his absolutely bizarre long island accent meets joe pesci voice) "sounds great, you just gotta filter out the crowd noise."
incidentally, the place closed about a year later and the CD was never finished.