If you crash in a commercial flight simulator (the type used to train airline pilots), what happens? Do you get a pop-up window in front of you saying "You have crashed"? Does it just show the last scene from before the crash until the simulation is reset? Does it just turn off?
All that happens (in the Level D CRJ machine I trained in) is the visuals black out, there is a sort of crash sound effect, the machine freezes in place momentarily, then returns to its level docking position. The instructor has to do a reset procedure at his controls to get it back in business.
When doing V1 cuts (engine failure during rotation) for the first time, it's not uncommon for pilots new to swept wing jets to crash the rig, because with swept wings the roll rate generated by a large yaw, that is uncorrected with rudder in time, will have you in a 45 o bank before you know it and the wing tip will hit the ground.
Airline pilots can train in a variety of certified simulators but you are likely thinking of the full motion level D simulators. In some cases its just some bad graphics of bouncing as seen here or other unrealistic crash dynamics.
Here is some info on what happens if a pilot does it during real ATP training.