Have you ever looked at a bright light, like the sun, and sneezed? Or perhaps, if you feel a sneeze coming on, you'll try to induce a more productive sneeze by looking at the sun?
I do that sometimes, and as it turns out, bright-light-induced sneezes are a syndrome:
Autosomal Dominant Compelling Helio-ophthalmic Outburst Syndrome, which those of you who are acronymically adept will notice, can be abbreviated as ACHOO if we drop the D.
Clever scientists and their acronyms.