Once brought a laptop adorned with loads of techie stickers to a conference, and all people could ask me was the background story behind those stickers, aswell as asking specifically about the tech in question. 'Oh you have an EFF sticker, do you care about digital rights and freedom?'.

Turned me off adding stickers after that. Not that I don't like discussing them, it just perks people's interest at the worst moments, when I'm focused on preparing my next talk for example. (Or maybe I don't want to school people on digital rights)