Our kids received a few last week...
They were selected to open "Indiana Jones" by coming down on stage and saying "lights, camera, action!" DD was wearing her "my first trip" button, and I think that is why they were chosed. (This was one of the best things that happened on the trip, and both of the kids are still telling everyone they see about it!)
DD received one for finding the hidden pickle ornament on the Christmas tree in Germany in the WS.
DS and DD each received one in Canada in WS for finding four particular stuffed animals the CMs had hidden around the shop.
I keep thinking there was another one, but I can't remember. I'll have to check the papers I brought home and add to the list if there was something else. We alse saw a little girl get one at Mama Melrose's. I don't know if it was her birthday or she just was selected at random, but she got a big platter with ice cream and lots of toppings to make her own sundae as well as a chef's hat and the certificate.