Saying god bless you.

I never say bless you after someone sneezes, just like how nobody says it whenever someone coughs. In my eyes, coughing and sneezing are equally valid methods for the body to employ to rid of foreign irritants, so I don't subscribe to this prevailing preferential treatment in favour of the latter.

The only bodily function for which I offer a spoken acknowledgment is the fart, my acknowledgments usually taking the form of a rating out of 10. And I only do this with close friends, as it is perhaps not appropriate for the times when the stranger standing next to you at the urinal releases one accidently through involuntary sphincter relaxation.

Jam it back in, in the dark.