Yes, all of these!
Food mainly, although I've got better at this lately. But it has to be on my terms - I'll share if its my idea! DP bloody loves giving his food away and thinks I'm mean because I don't 
My pens & paintbrushes. Hate the kids borrowing them and then not putting the lids back on or not rinsing out my brushes. I give them the crappy ones then they wonder why they can't paint a lovely neat line!
Hairbrush/make-up - more from a hygiene POV than selfishness though. Don't want to spread nits or conjunctivitis.
Sleep, yes. Anyone who wakes me, feel my wrath. I struggle to fall asleep so when I do, woe betide anyone who takes it from me.
Florentines. You only get like 8 in a pack and once the kids have had one each and DP has scoffed 2 or 3 I end up hiding the rest!
Once DP asked if he could have a Ferrero Rocher and when I said yes, offered him one, and then put the lid back on he said "I can't be restricted!! I'll eat as many as I want then replace them". I was 
and then when he went to replace them the next day, they didn't have any. He must have realised how out-of-order it was because a few weeks later he did replace them.
Towels, DP will use whichever is closer and he used to have a bad habit of leaving his (or indeed mine if he'd used it) wet towel on the floor/bed so it was still damp and manky when I went to use it. Now I make sure to hang mine up in the bedroom before he showers so he can't grab it if he forgets to get his own. (To be fair though, he's much better at hanging them up now, so it isn't as bad.)
I know what you mean about eggs Happily - if there's enough there to make a cake and then someone uses one its exasperating!
Mabelface well done for protecting yourself with strong boundaries - the only people who object to you having boundaries are the ones who benefit from trampling all over them 