Why You Should Never Accept Rewards

I just turned down a cash reward for returning a lost Blackberry that I found at a gas station the other night. The owner of the Blackberry thrusted a rolled up bill toward me from behind the wheel of her Cadillac Escalade and declared that "this is probably the best thing that's going to happen to you today." I politely declined.
What she didn't realize is that the value of everyone realizing how selflessly awesome I am after telling them about this vastly outweighs the monetary value of the cash.