u/aloofcord10

https://en.wikipedia.org/wiki/Thiazyl_fluoride, https://en.wikipedia.org/wiki/Thiazyl_trifluoride, https://en.wikipedia.org/wiki/Thiophosphoryl_fluoride

Favourite line for the latter: "It is useless for chemical warfare as it burns immediately and is not toxic enough". I mean, you just know looking at it that it wants to do murderous things to you.

I do think the thiazyl group is more cursed though. Sulphur-nitrogen triple bond