[sdiy] Chaotic/lo-fi patching techniques

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Hi everyone,

I'm currently thinking about alternative ways of making connections on
a modular synth, particularly of the primitive, somewhat random kind.
For example, German Synthi AKS improviser Thomas Lehn sticks bits of
metal in the Synthi "Prestopatch" slot and wiggles it around, to
short-circuit between various modules and make all kinds of sudden
complex noises...This is what I'm into as well. (It doesn't seem to
harm his Synthi, by the way).

I'd love to hear about other ways that people are "mechanically"
interfacing with their synths. I vaguely remember seeing some design
that just had a number of metal nails sticking up, for example, that
one would either touch or clamp crocodile cables to.
I also seem to remember something with a metal ball rolling around
another bed of nails?

Sorry to jump from lurking to taking up so much bandwidth all of a
sudden, by the way...

Thank you for any hints, suggestions etc!

Alex