I had the chance to go a few years ago and got the ears! (Didn't realize they sold out regularly). I wore them in the park the next day which was fun, but now they are a display cabinet at home. I also got a shot glass I think and the free stuff - napkins, pen, drink stirrer, etc.
We went for dinner and had one of the last reservations of the evening as we were the last group there. We watched parts of F! from the balcony and took a little tour.
Our dinner was interrupted when the fire alarm went off and we had to evacuate. I'm a teacher, so it was a lot like a fire drill at school. Our servers were basically the teacher and kept us together and reported our attendance to the person (principal?) that came by to check on us. All the kitchen staff and servers from the BB were out there also. We were waiting in front of the train near HM while F! was going and no one really seemed to notice the big group of servers, chefs, etc. standing around. After about 20 minutes we went back in and finished our meal - I forget what course we were on, but they brought out fresh food since ours sat out.
I know we were totally lucky to get the experience and I doubt it will ever happen again, but it was such a perfect night!
Enjoy!