I am the kind of guy that likes cracking off jokes often. Usually on the dry or deadpan side but everyone has their style. A girl I was interested in would give a short laugh at most of my jokes when we had a conversation. My insecure side would tell me she was just being polite or trying to avoid an awkward situation instead of really liking it. Having read that laughter is an IOI I was wondering if there was a way to tell a laugh of interest from a laugh of 'dont want to hurt his feelings on that lame joke'.