Hagrid's Cake for Harry

Rubeus Hagrid made this cake a breeze.  No need to construct a Hogwart's castle out of fondant or the Weasley's house out of gingerbread.  The kids can make lopsided, misspelled cakes all day long! 

Pink icing with green lettering. 

What is the line/crack down the middle?  Does it represent the lightning shaped scar?  Is it where Hagrid sat on it and broke it enroute?

Hagrid's homemade cake for Harry's 11th birthday
photo courtesy trwrobot