you want some feedback fun that'll piss off everyone you live with or near? Well sometimes I'll do this for hours, or till someone tells me to quit, just lean your guitar against your amp in an open tuning, or not, I just prefer the open tuning, and go nuts twisting knobs on your effect pedals. I particularly like delays, wah, phasers, flangers, chorus, and my digitech synth wah that is good for basically nothing else. You can also make some fun noise makers if you get into circuit bending, which basically just involves opening up old pedals and stuff you don't care about and touching a wire to different points on the board until you get a cool sound, then you sauter the bitch on and stick a knob or switch in it. Good times had by me, but probably not my room mates.