As well as the more normal, mundane stuff I've also done, all in the same job:
investigated fume incidents in jet aircraft where the cabin fills with smoke to determine the cause, health risks and how to fix it.
Worked on novel technologies for the alternative treatment of clinical waste so it can be recycled rather than incinerated or landfilled using bacteria from thermal springs.
worked in all sorts of secret facilities where they make "interesting" things
seen all sorts of joys in operating theatres investigating secondary infection rates from orthopedic implant surgery
from all this I've come to conclusion, I'll never fly again, humans are filthy f**kers, war is bad and I'd rather be operated on the car park than in majority of operating theatres in the UK 😀