I joined a band who were having a real torrid time with their "lead" guitarist.
Too loud, too centred on his "solos" and too concerned by how he sounded and really didn't care about anyone else or their enjoyment of the situation. One rehearsal the conversation was had. He was told in no uncertain terms that he was just too loud.
Sadly he wouldn't have any of it, so we decided to take more drastic action. It went something along the lines of:
[End of song being rehearsed. Guitarist still about 15395db too loud]
Guitarist: Right, I'm off out for a tab
[Door closes]
Everyone else: Go!
[Fuse extracted from amp plug and from pedalboard power supply amp and replaced with pre-determined duds]
[Guitarist returns]
Guitarist: Er... I have no power. What's going on?
Lead Singer: Dunno mate, my amp is fine and the PA is on...?
Me: Bass amp on over here mate..
[Guitarist swaps plug sockets, extension lead etc..]
Guitarist: WTAF??
Keys Player: I reckon you've blown that amp mate - told you it was too loud..
Guitarist: Blown it? Really?
Lead Singer: Yeah. I did hear a popping noise when you were out.
Me: And a bit of a crackle...
Guitarist: Oh poop. This is my dad's amp as well..
[Guitarist packs up in a hurry and leaves]
We didn't see him again.....