Take two drinks if that person is killed by someone other than Dexter
Down whatever you have if Dexter kills someone who isn't a murderer themselves
Take a drink every time Debra, Quinn or Doakes swears. (You might want to put yourself on a liver transplant list when using this rule, especially in the first two seasons.)
Take two drinks if Dexter swears
Take a drink whenever a crime scene is shown
Take two drinks if someone escapes Dexter when he's trying to kill them
Take two drinks if someone witness Dexter killing someone (in addition to the drink you have to take for a death)
Take two drinks if a character says or thinks "tonight's the night"
Take a drink every time ghost!Harry shows up in one of Dexter's fantasies
Take a drink if Masuka says something related to sex
Drink if Dexter says the exact words "Dark Passenger"