Annoying special interest

My friend has a very intense special interest and it's constant messages about it, conversations about it, pictures of it. I don't mind listening for a little while but we can never seem to have a normal conversation without them closing it off and focusing back on their interest, so I can never discuss anything in the real world with them before I'm dragged back into fantasy land. If I try and tell them nicely it's getting a little tiring and I'd like to move to something else they get VERY upset. What can I do to sort this out? It's becoming exhausting. (I'm very gentle about letting them know it gets a little tiring when I try to) 

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