To people who aren't me this is probably a stupid thing to ask, but I have real trouble talking to people when it's just me and them; it doesn't matter whether it's my best friend, a complete stranger, or anything in between. The typical advice is "Listen to what they're saying and use that as fuel", which is good advice, but it doesn't always work when your brain can't quickly make a link between what they've said and what to say/ask about it, which is pretty much the case for me a lot of the time.
I was having lunch in a cafe last week and I saw a couple in there who were talking to each other for a good half an hour. I couldn't hear what they were saying (and it'd be weird to listen in anyway), but I found myself wondering what they could even be talking about for half an hour, that's a long time to talk to someone on their own, at least for me it is anyway. Anyone can say "These napkins are neatly folded", but as a conversational topic it doesn't quite cut the mustard. So what's the deal here, where do people find these interesting things to talk about?