Really Ruined Birthday? All you had to do was stand up and sing it to your daughter if it was that important. Was the birthday song not a free service anyway in the past. They didn't charge you for doing it did they? You didn't pay for the service and not get it.

I can't imagine anyone having their birthday ruined because a business would not sing to them.

I agree with others that the noise is bothersome when establishments do this anyway. 99.9% of the other people are not having a birthday trying to eat or have conversation and most could care less if you are celebrating one.

You ate the dinner you certainly don't deserve a credit. If they had signs posted saying we sing you a birthday song on your birthday or your meal is free then YES. I have yet to see that sign up.