Pick up and flirt lines evolve with the maturity of the giver and receiver. My personal favourite was always. "You look like someone I could have an intelligent conversation with" The least you got was an intelligent conversation
I don't use either.
are you cold ? would you like a scarf ?
The "awkwardly avoid the other person" technique.
I do not exercise any of them either....I will just speak Warm, casual, honestly & keep 'eye to eye' contact....
was that an earthquake? or did you just rock my world?