Comment by IAmBroom

I'm pretty sure I'm allergic to methylene-decaffeinated coffee. I discovered in the early 1990s that I'd get sneezy almost every time I drink decaf office coffee, but my home decaf didn't do that to me.

Hasn't happened in a long time, probably due to (1) avoiding cheap decaf and (2) the banning of meth-coffee (heh) in the US.