Aren't you supposed to be able to get away from certain ghosts (they do not chase you if you get close) under certain circumstances (like if they are not looking at you)?
I have done this thousands of times but not sure exactly how I do it. Sometimes if you quickly move left then right at the right moment before the ghost touches you it will let you go right through it. I believe its much easier to do this on a game with speedup chip.
A booey happens when the hit detection pixel from both the pac character and ghost character occupy the same pixel. If you're about to die, reverse yourself toward the ghost and a small percentage of the time you will go right through...
I do the start of that on Ms Pac all the time on the strawberry board, unless Pinky or Blinky happen to be in the way You can do booeys on all of the regular pac games, Pac-Man, Ms Pac , Jr Pac, Pac-Man Plus. Don't think you can on Baby Pac or Super Pac, both of those have completely different hardware/programming. One guy came up with a 9th key pattern for Pac-Man that goes thru a ghost 9 times!