This is for the 1967 show, so you'll need a Netflix account and a love for strangeness.
Take one drink every time...
...an actor stumbles over his/her words. If they repeat their entire sentence or say lines in the wrong order, chug.
...Maggie Evans freaks the fuck out
...Vicky is flirty with Barnabas
...Willie Loomis acts like a grownup
...Barnabas is angry/jealous for some reason
...someone says "cousin"
...those eerie violin chords play (if Barnabas is acting jealous at the time, two drinks)
Two drinks every time...
...London Bridge. 'Nuff said.
...Carolyn is a slut/does something reckless
...Barnabas is very obviously a vampire
...Mrs. Stoddard acts suspicious, or suspiciously
...Vicky starts showing Josette-like qualities
...Barnabas wants to do harm to someone but only Willie takes him seriously
Pick someone who has to finish their drink, or finish your own drink if you're playing solo, every time...
...females act irresponsibly
...colors change (black and white to technicolor, or back to black and white--bonus extra drink if you notice inconsistent colors)
...there is a plot hole mentioned or created (for instance, Josette's ghost, the death of Paul Stoddard)
...characters are planning on getting hammered
...there is a bar scene
...Barnabas says "Very well, then." or talks about love
...Vicky's voiceover mentions anything about the ocean, evil, darkness, mystery, or strangers.
...the music plays DUM DUM DUM
If a new type of mythical creature appears or is mentioned, finish your drink and half of another one.