Join the AMC stubs club, and at the free tier (Insider) you get a free large popcorn on your birthday, and waived online ticketing fees for 4 tickets per month.
Join the Denny's rewards program and on your birthday you'll get a coupon good for a free item. Also, you'll get a coupon for 20% off on your next visit.
Sign up for Jimmy John's Rewards club and you'll earn a free sandwich after your first purchase as a member. You'll also get surprise deals on your birthday.