Well in my kitchen, we started with things in the kitchen, but then our cleaner, better known as satan, started locking all our things away, so we ran out of stuff, so people started using other people's stuff without asking - which was ok - but then they'd leave it out and not wash up and it would get locked away too, which the owner was obv not happy about! So for that reason some of us, including me, kept all kitchen stuff in our rooms, and loaned it out only to people we could trust, when asked.
The worst one is milk. Buy milk at your peril. It will disappear faster than a mug of water in the Sahara.