So this patron comes up to me at work and exclaims "You've lost so much weight! You look great! I simply MUST know what you're doing!"
So I tell her about SparkPeople, and direct her to one of our public use computers immediately, so that she may start her profile.

The BEST part of this was, I had lost maybe 5 pounds. Not what I consider a significant amount, and certainly not one that I thought was noticeable.

That patron made my day.