My favorites were Evander Holyfield Boxing, Mickey's Castle of Illusion, and an obscure game I picked up out of curiosity.  It's called Boogerman.  Extremely fun side-scroller full of booger-flicken, gas belchin', bend over and fart at your enemies fun!  I had to hide it when my son started playing video games, and now all I can find is the empty box.  I have a feeling that the wifie knows where it is...
Geo