I played an open-mic jam this past Saturday. Provided my bass rig - a Carvin BX1500 with 2x10 and 18 cabinets. There were three other bass players there, and we spent most of the night swapping in and out of the band. No problems anywhere... ... until Kirby showed up about three hours in. Now I'd heard about Kirby - great player, but somewhat on the eccentric side. Likes to mash-up tunes without telling the other players about it. Spends more time fiddling with his amp settings than he does actually playing. I was more than ready for him, though. I introduced myself as the owner of the bass rig, and politely asked him if he could leave the settings as they were, since the other bass players and I were more than happy with the tone. A non-committal nod from him. When he got up, he spent at least 20 minutes tweaking seemingly every knob on the head. I sat quietly and watched. When he was satisfied, he started playing. I walked over to the amp, waited for him to finish his first song. When he turned (huge s***-eating grin on his face), I held up my cell phone to show him a picture I'd taken earlier in the evening: "These were the settings on my amp before you started monkeying around with it. What you do with your own amp is your business, but what you do with MINE is something else altogether. You can now go back to the mike and sing your second song, during which I'm going to put the amp settings back EXACTLY the way I'd had them, and which I'd asked you not to mess with. Please don't touch the amp again." He finished his second song, and right away walked over to the amp and started playing with it again. I went over and said to him "I guess nice doesn't work on you", pulled his cord out of my amp and started breaking the amp down. The jam leader asked me not to leave as the jam would've ended at that moment, and I said "this guy doesn't understand a simple request, such as 'don't mess with the amp settings.' I couldn't have explained it in plainer English than I did. Gave him three chances. He's done, or I'm done. Your choice." The jam leader being a friend, he told Kirby to sit down for the night. Did I do the right thing, or should I have just let him be and reset it when he was finished?