Some person downstairs starts bitching about the noise from your (acoustic) guitar....

how do you respond....

Tell them to fuck a cuttlefish
I remember Mitch Hedberg's joke:

"I used to play loud heavy metal in my apartment, and my neighbor would always knock on the wall. So I decided to mess with him: 'Go around! There is no door in the wqall, you will have to go around, sorry'"

That's not perfect, I know, but it was the best from my memory
Apologize and remember to play my guitar at more appropriate times.

I lived in an apartment and it is pretty sad that an acoustic can be heard so easily through the walls.
ask them what they want me to play and i sing them a song.
There is a war going on for your mind.

If you are thinking, you are winning.

Resistance is victory.

We are building up a new world.
Do not sit idly by.
I'd shut the door. Seriously, acoustics arent loud.

IS this like a roomate, or just someone in the same building?
Epiphone Les Paul (Modded with 2 passive pickups and an EMG81)
Yamaha RG guitar w/ Floyd Rose
Rogue Acoustic

BlackHeart BH5 Tube Amp

Danelectro Metal. Digitech Bad Monkey, Digitech CF-7, Crybaby Wah, Danelectro EQ.
I invite them over for coffee.

Then I proceed to tell them about Jesus.

stop playing. play an electric guitar, unplugged, like a respectful guy.
Quote by archerygenious
Jesus Christ since when is the Pit a ****ing courtroom...

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My next door neighbor plays guitar. An acoustic can definitely be heard through the walls, lol. I love it when he plays though. He's pretty good. I'm sorry he has to listen to me all the time . . .
melt their faces off with a blistering solo.... that'll teach em
Highway One Tele (w/Custom Shop 51 Nocaster pickups)
Standard Tele (modded to Nashville specs)
Reverend Roundhouse

Orange Rockerverb 50 MKI
Vox AC4c1
Jet City JCA20H

And pedals!

"Shiva opens her arms now..
...to make sure I don't get too far"
Hook up the electric and let 'er fly...
That'll give 'em something to bitch about.