somehow i always tied the leather bracelet that my gf gave me as a gift to my shoulderpads or try to fit it under the glove. i just had to wear it and felt that some dude would break my neck if i didnt.
i actually do a lot of weird stuff, but i do not think that they make a difference.
maybe one thing, when i walk up to someone or i go to a counter or whatever, simply put situations where you know you will say hello or something in the next seconds, i always say "so.." very silently, almost to myself. idk why but i feel like the conversation is not so stiff or whatever. i just have to do it and it helps me somehow.