There's almost no limit to the ways you can make money, but most of them require work (that particular balance is known as "the human condition"). However, there are ways to make extra cash without going too far out of your way. Here are a few.

A small disclaimer that should go without saying: nothing in here is going to make you rich or pay your bills. The idea is to make a bit of extra cash while you idle in the checkout line, in a waiting room, or without doing anything at all. With the exception of large capital investments or owning a business, most things won't make you a ton of money for that little effort. However, a few extra bucks here and there is still something, and if you add up everything here you could give your petty cash fund a nice pad. If you want to put a bit more effort in, there are plenty of ways to make even more money in your spare time.