This is spot on. Since I'd usually got t-shirt from conferences other people in company joining, I'd always make sure to wear that shirt. So you went to pycon us ? (I'm from Asia and never set foot in the west) ... Oh no, only got their shirt ... and the conversation going on ;)
And I'll just add another one - always smile to everyone, this is my way to say implicitly that I'm ready to talk to everyone :)
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