 Passive income source number five is ad revenue. So I have multiple YouTube channels and I'm still building these channels up. So it's not my biggest source of revenue, but I do get what's called a mailbox check every month from YouTube, which means it's just a check that shows up in my account. I don't even have to think about it or look at it. So that's some of the most passive income you can possibly have. Of course, you have to build it. If you don't build the YouTube channel, then you won't get that mailbox check. So again, it's like the house, spend the time to build it up front and then down the line, you'll get paid.