I wear a pin with the Grateful Dead's lightning bolt logo on the lapel of my winter jacket. One of my daughters gave it to me for Christmas a year or so ago and I've been wearing it proudly ever since.
It gets occasional notice, usually from another deadhead passing by (there are a few of us here in Lower Slower Delaware). But sometimes it leads to cool conversations with less likely people.
This morning, as I sat in the waiting room of my eye doctor's office, an elderly woman sitting across from me asked about it. When I told her it was the logo of a rock band, she told me the story of teaching her grandson to play the drums. He's now 25 and delights in announcing who taught him when his rock band plays.