The chain is also celebrating Halloween with a Ghost Pepper Whopper on an orange bun.Have you been hearing unsettling sounds in your house at night, like sudden thumps, unexpected creaks, or strange footsteps making their way up the stairs? Chances are, it's either your clumsy roommate coming home at 1 a.m., or you have a possum infestation. But just in case it's something else – something supernatural – Burger King can help you check your place for ghosts. That's right: this Halloween, you don't have to Google "How do I call the Ghostbusters," you just have to download the...