Tape wrapped around the mic was already mentioned of course, but there's another annoying place where people shouldn't use tape...
Mic stands. A stand twists a bit, or leans, or slips slightly, and -instead of looking at the mechanism for three seconds and seeing how to
correctly correct the issue, they wrap duct tape asound the collar of the stand to prevent it slipping... or wrap tape around the clip... or half-dozen other places on the stand.
Of course, they take the tape off three days later when drums are finished, but the sticky goo stays on the stand and jams up the clutch, or other part of the mic stand which would otherwise work much better without the glurge gumming it up.
Honestly... for a simple instruemnt, the mic stand is a massively misunderstood device. -Of any ten assistants selected at random, I reckon that only about three understand how to correctly tighten them... the the rest resort to tape, and before long half of your stand collection is gummy and sticky and won't work properly...
THAT's only one thing that makes me mad... don't get me started, I'm such a curmudgeon...
Keef