Man, the last engine failure at our school wasn't mechanical... a student
pulled the mixture on my (ex) CFI while he was abeam the numbers on downwind. Scary stuff!
Good everyones ok

I heard of this happen first hand too...
In fact the engine failure drill on the Grob Tutor (RAF's elementary trainer) has just been changed. In "the old days" it was;
Throttle closed
Prop RPM lowUnfortunately, with the mixture lever being next to the prop lever (as normal), and with both being very small, they've now dropped the
RPM low action after a couple of close shaves and an interesting landing with solo students (the interesting landing thankfully was a foreign stude from a rich nation, and he was ok)

Charlie