The entitlement of some people is mind blowing. You do not have the right to use everything in a community fridge. You ONLY have the right to your stuff. If person A puts something in the fridge that doesn't mean person B can take it as long as person A did not write something on it.

I would put my name on my items if needed, but I don't have the problem of co-workers stealing food/drinks from the fridge. Because they don't think they are entitled to everything they see.