We used to give away bananas at business fairs and 10K runs and golf tournaments. You walked by, you got a banana. Sure, 
it was good advertising for our healthy cooking center, and yes, we let people sign up for our free meals. But we gave away bananas because people like bananas and bananas are good for you. If we just happened to remembered as the banana guys, well, that was fine.
This is from Guy Kawasaki, The Art Of Driving Your Competition Crazy:
Make good by doing good. Doing good has its own, very sufficient rewards, but sometimes you can make good and do good at the same time. For example, if you own a chain of hardware stores, you can help rebuild a community after a natural disaster. You're bound to get a lot of publicity and create bonds with the community — this will drive your competition crazy. And you'll be doing something good.
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