Hi nullandvoid, I don't really experience this, but when I was a very anxious teenager, I did experience it. I do have my own quirks and oddities now too So you're not alone in feeling like you're different. 1.) I wonder if for you, and I don't know your diagnosis and you do not have to tell me, but I wonder if part of this might be an anxiety thing for you too. The laughing. Like you're trying to suppress it, but it just gets more and more funny and unable to be stopped? 2.) Could it be perhaps not that big of a deal? I do recognize that you may want to be appropriate, in socially appropriate situations, and not be "rude," "offensive," like say, at a funeral or serious work event. That is very nice of you, and considerate and well, social. But I do think you should not be so hard on yourself. I don't know if there's a particular diagnosis it goes along with though, like I said, I had extreme anxiety when I experienced it. It was also...I think a way for my mind, and my body, subconsciously, to let out some of the tension I felt. Laughter is, after all, very therapeutic.