Regarding cold approaches....do bold, utterly cold approaches actually work? For example, I've done 3 hardcore cold approaches in the past few days with this line:

"Hey I saw you and I know I'll be kicking myself for the rest of the day if I didn't ask you out. You want to have lunch with me?"

Should I get to know them a little with some chit chat, or just hardcore approach? The first one I did some chatting because the setting made sense, the other was at a restaurant (in front of her friends), and a third was at a grocery store. The latter two were cold.

Any way I can make my cold approaches better? Or should I just continue with cold approaching. Right now I'm doing it for the lolz and fun, and a way to get over anxiety and rejection.