The control room in the first studio I ever set foot in had a panel in the rack with a 1/4" jack and a knob. The knob was labeled "suck." The jack was a DI, if memory serves. The knob didn't do anything. He would mess with people by plugging their instruments into the jack and turning up the "suck."I have an amp footswitch that currently isn’t connected to anything, so I can just step on it randomly during the set just to look like I’m doing something.