Have a baby in diapers or know someone who could use a coupon to save a couple of dollars off diapers? Head on over to Walmart's site and then click the share challenge to get your coupon. I shared with my Facebook friends (it lands you on a tab to send via email, which you could do if you wanted to) by selecting the social tab.
It may be just me, but the window said it printed and it did not. I tried twice and it told me that I had printed the max times. There was paper in there too. Maybe you'll have better luck!