I've never understood why collectives don't feature a guarded and last-resort "kill everything immediately" trigger, or perhaps they do now in the latest generation machines?
I really needed one of those during a running landing in a 109 that lacked drive to the tail rotor at the time. Thankfully I had a cameraman in the P2 seat who was able to chop the overhead throttles at the time that I REALLY needed both my hands on the flying controls. Without him I doubt I'd be here to tell the tale.
You guys can probably think of other circumstances in which you could have done with one of those?