Toilet rolls. Finishing down to the last two sheets and not getting another one out, ready to go.
It's common curtesy, you poo, you flush, you almost finish off the loo roll, you get another one ready for the poor soul who follows you.
Then again, I've hit one worse, in a toilet in some hole in Perth, Western Australia, some kind soul had finished their business and disappeared. It was only on pulling the paper out of the wall-mounted dispenser, to furnish my own needs, that I joyfully and rapturously discovered that some filthy animal had shat into the dispenser itself, coating the paper with brown product.
My car was sought, after washing my hands almost red raw in the sink, and anti-bacterial wipes from the boot were liberally applied. Impressed, I was not.
Flush the logs then wash your ringpiece in the water like a Musli... Like somebody born east of Istanbul. Dry on curtains or underskids. Or bend over in front of the hot air dryer if somewhere posh. Sorted.
Borrowing my car then leaving the driving seat in shortarse position causing me to bang my nuts on the steering wheel as I leap in. Cnuts trick.
My missus shaves her legs/bikini line whilst in the shower and doesn't wash the offending pubes away. I have a shower afterwards and look down to find I have feet (well foot actually) like a fcuking Hobbit ...