The weather or how about kanye west being a pillock lol - only joking. It is hard to say really depending on the situation you in. Day game or night game? It can be anything. I like to talk about all the different cocktails if I'm in a cocktail bar. My fav opener is "that looks tasty, what is it?".......if I'm in a club, "do you like this kinda music" so talk about the music. Personally the topic of conversation relates to your surroundings....if you run out of things to say, there are a few threads in the forum for ideas. Sorry would love to give you the links but my phone is being gay right now........

Much Success