Here's how it works.
Throughout the month of April, if you donate $1 through Joe's Crab Shack to Autism Speaks, you will receive a coupon for a free kids' meal entree. If you donate $5, you'll get a coupon for a free order of Crazy Good Crab Dip. And if you donate $10 you'll get a coupon for a free Classic Steampot with a $10 donation.
You must donate by the end of the month. The coupons are good May 1, 2013, through June 15, 2013.
Click here for more information.
Thanks to The Bargainist for this tip.