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Maybe sort of a long shot but... .did any of your pwpds also have this obnoxiously loud fake laugh?  I keep thinking maybe it's just to get attention but it's crazy to think how desperate this would be.

Hello!

My mother (uBPD) laughs obnoxiously loud. At this point it is just the way she laughs, but my mother does love being the center of attention.

We went to my cousins wedding (her sisters son) and she was so jealous because it was so nice, and the attention wasn't on her and her family that she started acting out. During the rehearsal dinner she was angry because she wasn't seated at the table she thought she should have been seated at so she started laughing (pretending)... .I guess to make people think she was having a wonderful time at her table... but it was very obvious what she was doing and looked pathetic.

So yes... .I think that at times they use obnoxious laughter to get attention. 

   

My BPD dad's npd girlfriend does. It's very obnoxious. My father is also narcissistic but she's the out going, obvious type.

It looks really pathetic, yeah.  I keep wondering how they think it actually makes them look better, but they're probably not consciously thinking about it.  My brother for example didn't start out doing that but after a long time he gradually picked it up from other relatives.  It's pretty scary to me actually, because it's got this uncanny sort of "hollow" quality to it as opposed to a real laugh.  It ends up sounding more like frustrated desperation than anything you would actually associate with laughter.

Sometimes it's even weirder because it ends up being out of place, like nothing happened that was even funny and still out comes this forced obnoxious laugh like they don't know what else to do so they're just trying to distract themselves from their own uncertainty.