There's a long series of posts by Derek Lowe on Sciencemag.com called "Things I won't work with", like this gem

https://blogs.sciencemag.org/pipelin...gen_difluoride

The heater was warmed to approximately 700C. The heater block glowed a dull red color, observable with room lights turned off. The ballast tank was filled to 300 torr with oxygen, and fluorine was added until the total pressure was 901 torr. . . (atmopheric pressue is 760 torr, for those of you not in the know, so this is a pressurized container at 700C filled with fluorine and oxygen

This is really exciting chemistry.

The whole list is here https://blogs.sciencemag.org/pipelin...wont-work-with

Mostly it's things that go BOOM if you look at them weirdly, but some of 'em will dissolve you first THEN go boom...

Every once In a while I read some of 'em just to remind myself just how much safer it is doing IT versus chemistry :-)