The other day, a couple of builders in a van pulled up alongside me and said
"Excuse me, would you mind giving us directions?"
"Yes, of course! Um, where to?"
"yer FANNY."

I actually laughed for about 10 minutes. I am in fact, laughing right now as I think about it.
Honestly, I was close to just getting naked there and then, so amazingly awful was their line.

SO YEAH! What is... the best line you've ever used/had used on you?
And has a really awful line, in the history of ever, ever been successful? I doubt it somehow.