Grim Reaper's Age Guesser
By answering the 12 questions, the Grim Reaper guessed people's ages and was not usually off by more that 10 years.
The program learned which questions were better at guessing ages. Was it, "How many years ago did you last hop?" or "How old is middle age?", etc. Then it applied these results to future guesses and showed the visitor the calculations.
Fun for all ages from Dan Zen.