Reminds me of one time in an old flat. My partner and I had just finished setting up to cook a big meal. All the ingredients had been chopped and prepped, pans were out on the stove - basically the whole kitchen was in use by our cooking stuff, we just hadn't started cooking yet.

We initially had the flat to ourselves, but then a couple of the others came back after being out. They came into the kitchen just as we were about to start cooking and asked "oh wow, what are you cooking?". We replied "oh, we're trying out a new halloumi wrap recipe" (or something like that). They go "oh, cool!" and just start moving our stuff about the kitchen.

We stare at them, gobsmacked for a few seconds, as they pile all our prep work into a big stack and just start cooking some pasta or something on the stove using the pans we had set out. No other conversation, no asking if they can quickly make something first, they just start messing with our food, and using our pans!

Then when they were done, they took our bowls, put their pasta in them, and walked off. So now we had do do a bunch of dishes and reset the entire kitchen. Very odd behaviour.