I can talk for hours about food, chocolate or computers. I could talk for DAYS about music. Pick your poison and prepare to be bored to tears.
Okay, seriously... in normal conversation I can talk about whatever the topic is. If I don't know anything about the topic I listen. A friend of mine at church is really into stunt bikes, of which I know nothing, but it does him good to enthuse about the topic so sometimes I listen to him enthuse for a while. Then we go on to a topic we both know something about, like what new kind of dark chocolate we found and where we found it. Or I might relate a trick I found out in the computer world.
If you talk to me about sports, any movie or TV show, or any star of said movie or TV show you will probably have to do most of the talking. But I can listen.
Talking about conversations though, one of my favorite things to do in the mall (while I'm waiting for others to go shopping) is to park my carcass on a bench and wait for a conversation to start. You meet so many different kinds of people, and you don't have to try to start a conversation. They just start.
Once I was in a mall on Black Friday. No, I was not fighting the crowds to shop. *shudder* I was just waiting for my friends, who were shopping warriors par excellence. There was a little train going through the mall, a kid's ride, "The Santa Express." This elderly lady sitting beside me started singing to herself an old gospel song, This Train is Bound for Glory - "I hear that train a'comin / Comin' round the curve." As a bona fide, card carrying music nut I had that song in my collection (by Wendy Bagwell and the Sunliters) so I started singing with her, and we finished the song in grand style. Then we started talking about old gospel music, and the time passed swiftly.
Anything can start a conversation. Once I was at the hospital with my family, visiting someone who had cancer. While there, I popped down to the hospital cafeteria to get something to eat, and wound up getting some lasagna. While I was eating it in the waiting room a group of friends was in the waiting room talking, and one of them happened to ask "Hey, what ya eating?" I said it was lasagna, then I said, "But you know, it seems odd that a hospital cafeteria would be serving this. It's almost like they're trying to drum up business for the cardiac wing. "'Here you go, hope you enjoy it... see you soon!'" That was a good ice breaker, and we proceeded to have a nice conversation. Never knew who those people were, never saw them again, but I bet they remember the lasagna guy.