Well, Spence Olchin did. (Well, I don't think that he ever go there. But he tried....and freaked out all his friends and girlfriend.)
But back to The Big Bang Theory, I don't think I've ever heard the BBT people mention Dark Shadows, although I've been waiting for it. I only have seasons one through four -- only watch them on DVD, so I don't know if they have mentioned after season 4.
Can you just hear Penny -- asking Lara Parker about her writing? "How's that workin'n out for you, hun?"
Howard's mother from the bathroom: "HOWAAAARDDDDD, Bring me back David Selby's autograph....BETTA YET, bring me back DAVID SELLLLBBBYYYYY"
And of course Sheldon will be telling all the cast members about his theory on Parallel Time and the plot holes it caused on the show, which is why he couldn't watch such an ametuer......WELL, you get my point. LOL!!!