And had popped into a cubicle and closed the door when I sneezed. Not an issue, until, from the next cubicle, I hear a quiet but distinct "bless you".
Now, I don't know about you, but inter-cubicle speech is an etiquette no-no. Once you start acknowledging speech, how can you ignore the various other sounds that may emanate from the cubicle next door? I realise it's polite to say "Bless you" when someone sneezes, but surely this is trumped by toilet etiquette.
I chose to pretend I hadn't heard him, and got on with my day.