They had a birthday cake one time I wanted to try so bad but when I got around to going there (2 hour drive) they had already stopped selling it.
The birthday cake shake was awesome, with the exception of the confetti. They put little round confettis in the mixer with the icecream, so when you were eating it, there were little hard crunchies. I would have preferred a small cute sprinkle of them on top of the shake. My other experience with the birthday shake was that depending on who made it, you might not get the chocolate topping, and would instead get plain whipped topping.
that is my review, lol.