I was repainting the bathroom when I had a thought.
Yes, just the one.
I thought: Hearing people burp makes me sick, so isn't it a good job that hearing people fart doesn't provoke a similar, but lower down, reaction.
And just to clarify, I don't like to hear other people expel poo-air. And the bathroom is now a deeper, richer red called Gorgeous (although it's not quite finished. It needs touching up. I'll do it tomorrow...).