Hah, I never knew that, but that's brought back a memory of disassembling "Halls of the Things" on the ZX Spectrum.
Was running through the code with my monitor/disassembler (DevPac, for those of you with long memories!) and I found the standard mapping table for the keyboard that pretty much every program had, but this time, immediately following it, was the ASCII text: "Yes cunt, a keyboard table". I nearly fell off my chair laughing... that someone had such hostility to spend the bytes at a time when memory was so seriously precious. A while later I found the main loop similarly flagged with similarly abusive comments scattered throughout it.
At the start of the code was a phone number belonging to the devs' home city. The only reason I didn't call it was that it was two years after the game had come out, and the early 80s video game bubble had well and truly burst by then. Most games I hacked (purely for fun, not profit) pretty quickly, but that was the most difficult one I'd ever come across (mainly due to a cunning custom tape loader) and I'd actually given up, back in '83 when it came out. A couple of years later, one bored weekend, I had another go at it and managed it. It was worth the wait.