Cow Chip Cookies in Seattle has giant rolls of free stickers by the cash register.
Customers can grab one, stick it on something, and advertise the store every day.
This is a classic of free word of mouth marketing: Make it really, really, really easy for your fans to talk about you.
Next time you spend a nickel on a web ad, stop and think if there is a better use for that money.
Lesson: How can your fans brag about you? How can you make it easy and spontaneous?