Those who know beta-Mercaptoethanol know that it is among the stinkiest, most sinus-clingy smells you can encounter in the laboratory. For the benefit of those who don't know it: It's a lot like a very dense fart from someone with serious digestive issues, it hangs in the air like a cloud of rotten ass for hours, and it simply will not leave your nose after you've walked away.
I'm glad I never have to use it, and I hate it when others in this lab do. Ew.