Vocal Drinking Games Starting With O

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One Big Chicken: Beer, People
One Brown Bear: A "Master of Ceremonies" who has memorized the list!, Plenty of Spirits, Two or More Players
One Dead Dog: 2 or more people, Loads of Beer or other drinks
One Duck: Beer, People
One Fat Hen: Beer
One Fat Hen, Option 2: Beer, Functioning Vocal Chords
One Frog: Beer, People, at least 3 (more the merrier)
One Minute Game: 2 containers to place slips of paper in, 2 slips of paper for each person playing, Deck of Cards, Pens/Pencils, Shot glasses for Beer
One Up, One Down: Drinks, People