Chuckie Egg on the BBC model B - when you have been playing forever and you realise that there is NO END to the game - they just keep on adding more golden geese and ducks untill you HAVE to finally snuff it.
http://www.old-computers.com/museum/computer.asp?c=29 ahhhh the nostalgia!
oh and those of you who have only known windoze based PCs or Macs you would be amazed at what you manage to do in 32K of RAM