I had a harrowing experience last night

A man broke into my bedroom.
I woke up just after midnight to the sight of him standing there, staring at me with a strange expression on his face. He was wearing a raincoat and had brought a cake with him - he stayed as still as a statue, pointing at it the entire time. We stared at each other for what seemed like hours, and then suddenly he turned and left without speaking a word. The only way I know I wasn't dreaming was the cake he left behind. Perhaps the strangest part of the whole ordeal was the cryptic message emblazoned in icing across the top of the cake - the digits "30"
I have no idea what it could mean.