You knock on the door..
Penny - Yes?
You - Hey, is Sheldon or Lenard here?
Penny - Sorry, they went to that star wars thingy. Who are you?
You - Star wars? i think you meant Star Trek. I'm an old friend of Sheldon.
Penny - Oh my god not another..
(Laugh track)
You - I wanted to swing by and surprise them while i was in town but I guess I should of called first..