Shawn,
In the very early days of the S-76A Sim out in the swamps of the Sikorsky facility we had few interesting situations within the Sim Computers Models that could be quite interesting.
One was the six inch difference in the Taxi Way Height somewhere on the airfield model. One could be taxiing along sweet as life itself and you either got a hell of bump when you drove off the Curb or a real smack when you drove into it. Patching that particular "Pot Hole" took a lot of work for our guy dedicated to resolving so many of the issues.
Later we discovered the "Black Hole of Pahokee" which was really interesting.
While flying around the Pahokee area which had a nice Instrument Procedure we used quite often....there was sometimes the impression you had flown into a mountain or had a mid-air collision it was so violent.
The results could be quite entertaining as the Computers all went crazy, various systems and gauges quite working....but nothing in a rational normal manner.
For training purposes it was great as no one in the Sim knew it was coming or what the results would be and we were left to cope with the results.
Taking the Instructor out of the Loop is not a good thing as a standard practice but inputting a random malfunction in at some point in the flight can work too. That should be the Instructors task....not some Wally set at a desk somewhere playing "What Happens If I Push This Button?".