TopCat wrote:You're not being thick.
That was an example of a variant of Muphry's law, which I'll call Topcat's law (more an aphorism, really) ... which goes along the lines of:
"Be careful when using the ' ' smiley, lest you post something that might itself deserve one".
In fairness, though, although I don't know the answer to your perfectly reasonable question, why would you slam the throttle shut in the cruise?
I don't in general - particularly now I know the effect! And I never "slammed" it. "Close it smartly" is what I own up to Doing a glide approach during my first checkout in the Pup was when I first encountered it. And then, ten years later, I was reminded of the effect in my first ever "hour with an instructor" a fortnight ago when we did a few PFLs.