When talking to him, ignore him whenever he says something strange, change the subject to something normal, e.g.
Him: I just met jim carrey
You: what did you have for breakfast this morning?
Whenever he says something normal, go with it, try to start a conversation. Its a behavioural treatment that can be used with many things, only rewarding him with conversation for normal stuff and not giving him any notice for the abnormal stuff. It should encourage him, if he wants to talk, only to talk normally.
I think he wants the company, but is just unable to go around doing what he would normally do (i.e. give you a call, ask hows things have been, arrang to go out to the pub with a few friends e.t.c), so makes the random calls. Do not humor his abnormal behaviours, but reward (by talking) when he is normal.
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