This is an Easter Egg that, according to Digital Press, I found in Dracula. But I'm sure I was not the first.
I was playing with Bliss emulator, but it appears also with the Master Component.
Select 1 player, Easy level. Finish day 1. On day 2, run right to the first set of buildings. Run left and you should see a victim. Get him! Run back to the town and press 1. The initials "AS" (for programmer Alan Smith) appear where the eyes were. You can display it multiple times.