World Toilet Day is almost upon us, no joke. And urine for a treat, because WaterAid is marking the occasion by running a competition to determine the UK's favourite toilet joke.

Why? Well, 2.5 billion people around the world still don't have access to a safe toilet. It leaves these people vulnerable to diseases, harrassment, and attacks, and it often forces teenage girls to drop out of school. Not fair!

So to start the conversation about toilets, some of the UK's best comedians have wheeled out their best potty humour for you. Vote for your favourite on the competition page!