My DS got one at DQ our first trip. I didn't even know what it was! He said that he was playing a video game and 2 teens asked if they could play with him. He said "sure" and after a few minutes they told him that they were CM's and gave him the certificate.
Also, DD has gotten one both times we've eaten at Cindy's on her birthday (signed by the princesses), and she got one when she was chosen to open Fantasyland one day.