Now come on dont be shy...
How about this.
Loading up a CD or Playlist, of a couple of hours worth of suitable background/warmup music, going out to the bar to chat to the guests/new barmaid etc, only to deduce from the silence 3 minutes later, that you've left the CD deck/Playlist in "Single" mode, instead of "Continuous"...
And/or
Getting to the end of the night, packing away, rolling up the leads and realise that you didn't plug in the lead between the speakers and the lighting controllers...meaning no lights were working in-time with the music (unless they had built-in mics).
Admit to either of these, or add your own forehead slapping Dohs!, or both...
