If I go way back, I suppose the very first mechanical keyboard I used was the Amiga 1000 keyboard. I gave it a go about a year ago, and the switches feel like crap: extremely mushy, not that I noticed back then.
My family also had various PCs, so whatever came with those. I have a still from a home video here, but I'm not sure what computer that is; it's not the Packard Bell I remember. Absolutely clueless on the keyboard.
As far as current mechs go, I ordered both a Rosewill RK-9000I (MX Blues) and CM QuickFire TK (MX Reds) at the same time. Those lasted me about three years until I got really tired of MX Blues and ordered a couple Model Ms. They're just stock, so I won't bother posting pictures.
Currently, at home, I've been switching between a V80 with TEX case and Matias switches and an M65-A with Zealios.
I'm not sure if a keyboard cake counts. My mom made this for my brother's 13th birthday.