Charlie thinks the top of the wardrobe is very much his and only his. He does not like it when Linus is up there at all. In fact he gets rather manic about it. He will allow Linus up there for a few minutes but then he decides Linus must go.
I try and protect Linus for as long as I can. I tell Charlie no he can't jump up there. I'll even block his access to the top of the wardrobe. Charlie will run off for a few minutes but eventually he comes back and forces Linus off.
Here's Charlie in action.