"The Idiot Photographer"
This peep has no self awareness or self control.
When I play smaller events, with just a keyboard/small system, I occasionally skip bringing a mixer, and simply plug my vocal mic into my keyboard and run the keyboard directly into my powered speaker setup. Up until today, this worked great.
However, when this peep is around, the system has a flaw. That is, when the Bat Mitzvah girls friends are singing their a cappella song about the Bat Mitzvah girl on the mic, said peep will go over to the keyboard and start banging on it along with them. The few 'out of key' right handed flute notes were annoying, but when he triggered the full-on arrangement of "Te Pego" with his left hand, the presentation was done.
Since there's no way to have the volume of the keyboard off, when the mic is being used for presentations in this setup, musicians need to keep a sharp eye out when the "Idiot Photographer" is on the gig.
"The Hapless Videographer"
This peep, who is not connected in any way to the "Idiot Photographer" will show up at the gig and discover that his camera isn't working. Naturally, he won't have a backup. Also naturally, he won't tell the client or call a colleague for help. Instead, he'll walk around pretending to shoot the gig, only to tell the client at the end of the gig that something went wrong and the footage is gone.
"The Clueless Booker"
This person will text you to ask if you're available. When asked what time/where the gig is, there will be no response. A few days later, they'll text again, asking about availability. The same exchange ensues and they drop the conversation again. A few days later... same thing. Just had three with one such peep, but had more with someone once.