I'm more likely to laugh on the inside as well. I'm surrounded on a daily basis by someone that cackles (oh how that grates on the ears) and another person that appears to have an uncontrollable nervous belly laugh. I'm sorry but when I'm in the midst of a serious conversation hearing a cackle and a constant ha ha ha ha belly laugh isn't what I would call infectous of the positive variety.

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When you get to the end of your rope, tie a knot and swing.