Dont worry about it. Its a good reason to not use canned openers though, but even still, its all about the delivery.
Say you used some lame ass opinion opener, and the girl says "Umm, I heard that line on tv, dumbass." You can turn it around if you're smart.
For example, you could play it off like: "well, dont look now, but there is a hidden camera on us right now, and if I get you to make out with me in two minutes, I will win a trip for two to be in the audience for the Oprah show. Help me out, I'll take you with me."
Or you could get mad and say "You know what? I made that line up, and those bastards stole it from me. Hell, I've banged at LEAST six hundred girls using that line. So, are you gonna tell me your name, or should I just call you six-hundred and one?"
Or, you can go overboard serious with "Well, I saw you, and I was enchanted by you, and didnt know what to say, and yes, I saw that episode too, and it was the only thing I could think of to come introduce myself with. Is that so wrong?" This would be done in your most 'adorable' delivery. It would probably make a girl melt, if you said it right.
Anyway, its all about the delivery anyway. Its nor what you say, but how you say it.