In a long-ago occurrence, a controller and friend of mine was working a mid-shift at my facility, when a VFR aircraft encountered IFR conditions. The controller was the "brusque" type, but was absolutely professional on the frequency, and handled the situation in a fine manner.
Trouble was, on the mids, we used handsets instead of headsets. With a handset, the mouthpiece is always on with the recorders. My friend was telling jokes and giving opinions, etc., which were laced with obscenities (none of which were about work, just general joking around).
It all went on the tape.
Management had wanted to give him a commendation for the save, but gave him a letter of reprimand, instead.