There is a thing on each side of your head that is a pretty good Nr gauge as well.
Resilience to self preservation is a fine thing only if you are aware of the consequences!
I know an individual who was on a demo flight in a light twin and was sitting in the back seat. The demo pilot flicked one engine to IDLE and was demonstrating the OEI performance and on completing the demo entered
a brain fade and flicked the remaining engine to idle instead - as the two pilots looked at each trying to figure ot what the unexpected result was the individual in the back seat pushed the collective down with his foot!!
Probably lucky it was a twin derived from a single.