Chicken or fish ?

when it comes time to go to a wedding, i can never remember what I ordered. I wonder if the kitchen just makes extra of both just in case? I was thinking you could solve this problem by designing a perferated (punch out) piece of paper as part of the invitation that you rip off and it says "chicken" or "Fish" or whatever, could even be the shape of animal. Number the back and tell people that there will be a drawing at the wedding so they remember to bring it with them.