I admit that I do not own a Mac Classic. Intrigued by the command+option+o+x bootable ROM ability, I peeked inside this ROM. I found this by importing the ROM as a fairly tall raw 1-bit 32-pixel wide image in GraphicConverter:



The final smile and sad mac faces are 16x10 bitmaps that occur later in the ROM:



This sure looks like an animated Happy Mac sequence. Can anyone with a Classic confirm/disprove if this actually got implemented?