What grinds my gear part (8)

what really grinds my gears is that why do we still cut cakes(i dunno why but i dont like cakes) on birthdays...a better question who the hell started the trend of cutting a cake on a birthday..is it somesort of an official thing that u should cut a cake..why cant we cut something else a pizza,sandwich,ur hair,old tapes...think abt it and if anyone knows how did d cake cutting thingy began pls do let me know...