Alone in the crowd

What massively popular cultural phenomena are you completely in the dark about? As someone who doesn't watch television (especially reality TV) or care about sports, I find myself totally at sea in half of my conversations with new people. I do read the online version of the papers, but I don't watch the news. Chatting about celebrity gossip is usually safe due to my obsessive internet surfing, but that's about the limit of my pop culture awareness. Augh!