Hypno Butt is constructed of brass wire, closeout bin and scavenged through-hole components. Light and sound patterns are made via a mixture of flicker candle LEDs, 555 timer, and hall effect sensor. He draws power through his feet. 9 Volts are his favorite but 5V will work if slumming it.
I feel pretty good about where this project is now but might revisit it sometime when I have access to a proper o-scope. Since I believe this is a novel 555 circuit using both the flicker LEDs and Hall effect components I'd like to know exactly what's happening. I've posted my theory in the comments.