It's embittering having to cough up 30p to use the toilet before a long train journey.
And while 30p won't break the bank, we all know it adds up eventually, for you - but also the station itself.
When you look at how much money train stations make by charging you to empty your bowels, it's pretty staggering.
Network Rail's figures from September last year showed that over the past three financial years, London Victoria has made a huge £2,300,511 from our weak, weak bladders.
London Euston, London King's Cross, London Paddington, Manchester Piccadilly and London Liverpool St also bring in more than £1 million, making £1,828,110, £1,394,795, £1,172,740, £1,115,677 and £1,007,414 respectively.
According to The Lad Bible, Edinburgh Waverley made £752,194 from its toilets while Birmingham New Street, a little surprisingly, made £702,533.
London Charing Cross made £653,721, and Glasgow Central brought in £601,478 - while Leeds made £544,976 over the last three years.
Liverpool Lime Street made £402,680.
Keep in mind that this money's spent on upkeep of the stations and toilet maintenance.
...But the numbers are still pretty irritating, no?
Feature image: Rafael Torres