Making someone's day

The last time I volunteered at Ford's Theater, I was working the outside line, meaning that I answer questions ("Where's the Spy Museum?") and make sure that everyone has the correct ticket. I noticed a guy's t-shirt as he walked into the lobby--"Rogue Demon Hunter." I looked at him and asked, "You hunt rogue demons?" He and his girlfriend stopped and looked at me. I was like, "Angel, right?" They grinned and said that I was the first person to get the reference. It was awesome.