I have a problem keeping my end of conversations with strangers. Especially people like cab drivers, clerks at shops, waiters, etc. Usually, when they say something to me it's generic and aimed at passing the time, but for some reason i struggle with coming up with responses to those things quickly enough. So what happens often is that i just smile or fake a mild laugh, and hope that they don't say anything else.
Unfortunately, many times it ends up being just the beginning of a string of generic stuff, to which i keep smiling, while struggling deeply to come up with anything. When i do come up with something, i almost always think "WTF did i just say?" afterwards.
Like many people, i also have a problem with not laughing when something mildly unfortunate happens to someone, like if they trip or something. I try to restrain it, but that moment of total lack of control makes me laugh almost every time (even when it happens to me), and sometimes at incredibly unacceptable contexts.
Two other things i mentioned before are, i suck at using public bathrooms (a very serious struggle for me), and apparently suck at making that heart gesture with the hand thing. i can't seem to do it without shaking and making the angles too severe.