"Good morning, we hope you are well rested and ready for the fourth day of our tour.  I am Igor, your tour guide.  I see the majority of our guests were able to join us again today.  My condolences to the families of those who left us during the night.

Today's hall includes victims of explosions. Evil, unrestrained, massive and deadly explosions. Mmmmmmm. Oh, my apologies, sometimes my daydreams become so real. As I was saying, explosions most deadly, created by your common combustion engine under uncommon circumstances.

Pinging, a cute term for such devilment! The poor unsuspecting piston and rod, happily rotating, on their way upwards to greet a nicely controlled explosion of gasses and oxygen brought about by a spark from a plug, only to be caught unawares and unready by pre-ignition and a massive explosion caused not by spark but by heat. This huge explosion forces the piston and the crank to do unnatural things, leaving a trail of destroyed and dismembered components in its wake.

The rod on the left shows hardened metal forcibly peeled away as a result of "pinging". The rod on the right is a pristine example of what this part is supposed to look like.

Pity this poor part, and the ignoramus who allowed it to happen. Pity the rider who doesn't jet properly, doesn't run proper fuel, pushes ignition timing too far, or simply ignores the loud pinging cries of an engine ready to explode it's guts over the landscape and turn perfectly serviceable components into Escher-like twisted remnants of expensive bits and pieces.

Mmmmmm, mangled. Oh, I forget myself again, my apologies.

...This concludes today's portion of our tour.  You are welcome to spend the night and continue with us tomorrow.

Ah, I see I have no volunteers to stay the night?  Well, in that case, I hope you've enjoyed your time, and I wish you the best of luck in the future...if you have one. The exit is an easy walk through this trap door, along the slippery edge of the shark tank, through Spider Cave, up the Twisted Steps of Doom, into the Dragon's Lair, through the Maze of Death, and out through the Crypt."