"Why the fuck did he not clean that up, who the fuck do you think you are just leaving your piss right there for someone else to have to wipe up. You're not 6 years old for Christ's sakes you rude cunt."
Which is what I think when I walk in and see it.
I mean seriously, it's not that hard. If you want to be a decent flatmate
WIPE UP YOUR OWN PISS!