Guy: "I wrote a MIPS R3000 emulator from scratch, ran it on a microcontroller on a board I designed myself, and emulated a late-80s DEC workstation well enough to run not just Linux, but also DEC's own proprietary closed-source Unix on it (although I had to patch the Ultrix kernel's machine code, without source code or even symbols in the exec, to fix a bug). For fun."
Internet: "Pssh. Not pretty enough. Next!"