Take a drink when:
- Marty says something about the future in the past.
- Doc says, “Great Scott!”
- Use of ’50s or ’80s slang.
- Somebody yells, “McFly!”
- Somebody says, “Flux capacitor”
- Biff bullies either of the two McFlys.
Take a shot when:
- Marty successfully time travels.
- Somebody is scared of altering the future, or is it the present?
- Somebody disappears from Marty’s picture.
- Marty rocks out.
Pour one out:
- For Marty’s mother trying to kiss him.