Harvey's Free Original Burger.

free burger... Harvey's is running a promo for their 50th birthday. For every burger you buy (any kind), you will receive a coupon for a FREE original burger on your next visit- kind of like the Wendy's FREE burger deal. I saw my friend with one of these free coupons, and it is just printed on a receipt (according to the redflagdeals thread, the free coupon receipt automatically gets printed out for any burger purchases, including hot dogs).

• The coupons cannot be used on the same day (got to wait at least 1 day) and they expire within 3 weeks (the entire promo runs until August 2, 2009).
  
• Make sure you get a free burger coupon for each burger you buy, even if they are bought together- ie. if you buy 3 burgers, make sure you get 3 free burger coupons