Spiking DHV conversation = you give lots of DHVs (Demonstration of Higher Value)
Small exemple of DHV:
"One day you went to school/college/work and in your way there you saw a girl crying in front of a tree. Her kitty was up there and she couldn't get it. You decided to offer your help and you saved the day."
DHV is ment to make girls think you're different from the other guys. The story I gave you is purely an exemple, I don't think that'll work on the field

but then again, you never know.
Just tell them a story about you, or invent a story and tell it to them where you point out subtle that you're a guy who... let's say "loves animals" / "who is funny" / "is romantic" / "is a irrestible asshole" ... etc.
However it has to blend in with your way of talking to them ever since you opened the conversation with a group or with just one girl.
You wouldn't like to give them the impression you're a romantic dude and then tell them a story about you beating a guy for stepping on your toes
