For Mike McGonigle, it's a sticker on his car that gives him away as a Grateful Dead enthusiast.
"There are Deadheads amongst us everywhere," he says. "I constantly get people waving at me, I see other Deadhead stickers, and it's kind of a community of people that when you recognize it, you have a connection with those people."
In the 1970s and 1980s especially, there was a vibrant community of Grateful Dead followers here in Kansas City. They used to follow the band's tour route: going to shows, trading sandwiches for back-rubs, sleeping in cars and otherwise living the hippie dream.
Most of them have settled into mainstream society since those days, but this summer's 50th anniversary reunion shows have brought members of that community out of the woodwork — and back into contact with each other.