It reminds me of an embarrassing incident that happened not too long ago to a student in a detachment of a certain military training school who used squirrels with a twist grip throttle mod(keeping a veil of secrecy here of course!). I wasn't involved, so I hope I get the facts straight, but it went something like this.
After a number of introductory flights, students would get to the stage where they were written up as safe to preflight and start the aircraft, to then wait for the instructor who would wander out and strap in.
A hot start could be a bit of a problem with this throttle setup, because an attempt to hastily close the throttle could result in the operator fighting the release mechanism and being unable to shut it off. The alternative means of cutting off the fuel was, funnily enough, the fuel shutoff lever on the floor, which is operated by pulling upwards.
Anyway, this particular student goes to start the aircraft...hot start imminent...tries to close the throttle, it gets jammed...goes for the fuel shutoff lever and gets it, but jags the collective as well...aircraft leaps up into a high hover, luckily moving clear of other aircraft, then runs out of fuel due to the shutoff being closed...falls in an undignified heap to the ground, as the horrified instructor, on his way out to hop in, looks on!
Student fortunately unharmed, aircraft smashed up. Ouch!