I have recently joined the Microsoft Spam Fighters group. They ask you once a day to analyse a mail you received and label it Spam or Not Spam.
Once you did that you get a redirect to a page displaying following message.
We have recorded your answer.
Your selfless dedication to your fellow citizens of the Internet and heroic participation in this program is helping us fight the great evil of this world known as spam.
Keep up the good work!
Made me smile 🙂