birthday pt.2

so i think ive decided the theme for my 8teenth birthday and that is scooby doo. Not going to lie it is quite random as scooby doo is not my favourite show or anything,,,, the idea just popped into my head and i was like oh fuck yeah , im gonna dress like one of the hex girls or something,, but now i have to see what kind of cake i should get to match the vibe or maybe i should do something related to ghosts and all that? like spirits , ghosts basically anything close to a fanthom..what's you guys's opinions?