Randy: Anyway, let's, uh, start with the basics. A car burns gasoline to create small, carefully-timed explosions, whose energy is converted by the engine into forward motion. I'll show you how that happens.
[As Randy explains to the class:]
Frasier: So, the engine is just like the timpani, the way it drives the orchestra forward.
Niles: The conductor drives the orchestra, not the timpani.
Frasier: Niles, the conductor guides the orchestra. He's more like the steering wheel. The actual driving forward, the driving forward is actually executed by the percussion section.
Niles: Seems like someone needs to take a class in orchestra rather than automobiles.
Randy: ...which links the crankshaft to the camshaft, so that the valves are in sync with the pistons.
Shirley: Oh.
Randy: Now, as you can imagine, tolerance is very important in every component...
Niles: What's a camshaft?
Frasier: I don't know, you were talking.