a joke about someone else lol, seeing someone fall or hurt them selves in some way umm, a good joke (blonde and rude jokes usually do the job for me lol), making a funny face... depends on the mood were in. if its a good mood we'll laugh or giggle but if were in an "idle" mood or just a "cant b bothered" kinda mood then we'll crack a smile but in our heads we'll be thikning, what an idiot. Unless ofcourse it was hilarious then we'll laugh.
It doesnt take much. We love to laugh through witty jokes. Keep coming at us with witty conversation, be alert, be responsivem, be on the ball with your questions and answers and conversation, dont let there be a momment of "silence" keep the conversation flowing and you'll prob get a smile at the end of it or during the conversation