The actual idea of a rehearsed opener really applies to when you are opening to sets of people, i.e. 3 or more I'd say.
Sapmi is right that he needs to find his own style, your appearance and style should be reflected in the first words that come out of your mouth.
Couple of weeks ago an old friend came up and started talking to me, she started small talk as in "So how has life been treating you?", as to which I replied "Fuck off and say something worthy since you havent seen me in 7 years." She laughed and there was instant connection. You gotta find your own style. Now, Sampi is right in saying it will come to you once you get the hang of it but having a few, perhaps dry, rehearsed openers cant hurt either.

For the record, I think the Chuckle Brothers thing is great.