Science fiction in-jokes just aren’t funny any more

Via IO9:

But yeah, in-jokes are the weakest form of humor. Instead of being outrageous, counter-intuitive, clever or weird or any of the other things a joke can be, they're just sort of comforting. In fact, they're like the oatmeal of humor. They're warm and familiar and have the same consistency all the way down. Your spoon can stand straight up in a bowl of in-jokes.

I couldn't have put it better! What do you think?