Why does my belly button smell

Trains, they’re a pretty boring place. No one speaks or even looks at each other, if they do, it’s generally with disdain. So I fired up my laptop for something to do and started typing expressions into Google to see what the predictive search thing would surprise me with.

My favourite of the evening’s journey was “Why does my belly button smell?”, amongst several unpublishable expressions my mother wouldn’t be proud of reading