Having recently been to a music festival, this situation is fresh in my mind. Using a portaloo is one of my biggest fears and one of the reasons I rarely do weekend festivals. The dark, dingy box which is too small to manoeuvre without touching edges that shouldn’t be touched. Too dark to be sure whether the liquid substance you brushed against was ‘water’ – undoubtedly not but I try not to think about it.
They are inevitably lack toilet paper so the person before you who didn’t think about taking in a handful of ’emergency loo roll’ has had to use a paper towel instead (if they have one) and that is now stuck in the bowl. And the smell….oh the smell…
well anyway… it made me draw this picture.
Big Hair Metamorphosis 
This is my experience with most public toilets. And alas I have been blessed with a very small bladder. So I rarely make it home having not engaged public toilets. The struggle is real!
I feel your pain! Peanut bladders are a drag – always have to sit on the end of a row at the cinema, always sussing out the nearest ‘convenience’ at every venue…LOL 😖
Oh yeah, those porta potties are the absolute worse.
Evil … Pure evil they are.
I feel your pain. This issue has also influenced my attitude towards many outdoor activities.