Asa astarting point, I'd suggest you get them to look at the online safety slideshow given by former USAF BGen Spruance:
This is work-safe, but it contains images that show the effects of not wearing fire-retardant (nomex) gloves, suits and flying helmets.
If you don't want to see an image of what a simple cockpit lamp did to the unprotected head of one unfortunate aviatior, then don't follow the link.
Safety Briefing
Spruance has been instrumental in saving the lives of many, many people over the years. I've seen his safety lecture, and it is truly humbling.