A few years ago so many people on here was talking about how they got the grapefruit cake from the Brown Derby at the bakery right next door but that if the bakery wasn't open you could walk into the Brown Derby and ask the host for the cake to go.
So we were in the park one day and I wanted some grapefruit cake, sure enough the bakery was already closed so I walked into the restaurant to see if I could get some to go and the host was really rude about it. He acted like it was the most rediculous thing that I would even ask. He said he had to ask the manager and the manager came out and didn't have any problems with it, she was very nice. I waited out in the lobby and a waiter brought it out to me. I paid him and gave him a tip and was on my way.
So yes, you can do it but be prepared for an attitude. I only asked them because so many on here said they had done it and never acted like it was a problem. It may be something they don't really want to do but will if a guest asks in order to keep them happy. I personally won't ever do it again. It wasn't like the restaurant was busy either, I never would have done it during a peak meal time.