As a teenager, after three broken membranes of a ZX Spectrum clone, I'd decided (and of course due to the lack of budget) to construct my own wooden keyboard made of wood, a bunch of screws and a sheet of bronze in order to make the key contacts.
Worked like a charm except for an strange flickering of my black and white TV set. At that moment I didn't know too much about electronics, filters, capacitors and things like that.
As an extra embellishment I made two DB9 ports connected in parallel with certain keys of the matrix in order to resembled a Cursor joystick and connect an old Atari joytick to it.
Unluckily I've lost it and have no photos.... I sincerely hope that as a last homage it made part of a barbecue in my parents house.
PS: Since I'm from Argentina, the barbecue is the correct way to incinerate old memories :-)