Check out this site: https://www.bctip.org/en/ I heard about it on the radio today.. The next time you are out, and need to leave a tip.. This site allows you to create and leave a tip in bitcoin, via printable coupons! It spreads the word about bitcoin and helps the community as a whole.. The best part about this service is, if the person whom you gave the tip to doesn't claim the tip in XX amount of days, it gets returned to your bitcoin address! Check it out, the coupons are pretty cool, a very good way to spread the word! I may even use it around here in PMs.