Your birthday cakes are always depressingly macabre.
And no one wants to have a slice because they're trying to stay trim for their costumes.
C'mon, ONE SLICE won't ruin your nurse getup.
People get bummed out when you throw a birthday party and it's not a costume party.
You have to elbow through a mob of drunk zombies if you want to grab a quick birthday drink.
There are images of death on everyone's front lawns.
Your friends are always trying to pass off that Halloween thing they want to do as a special birthday activity.
"We'll celebrate your birthday at the [Halloween dance party/haunted house/graveyard tour]!" — Your friend who really wants to go to the [Halloween dance party/haunted house/graveyard tour]