Two things the YGO cast would never do!
Contains absolutely NO sanity!!!

Yugi
Kiss Joey (Unless he was drunk or drugged etc...)
Dismantle his Millennium Puzzle

Yami
Kill Yugi
Masturbate

Ryou
Snog Tea
Shag Pegasus

Yami Bakura
Play Bingo!!! ^_^
Live in an aquarium tank

Joey
Win a duel against Yugi
Kill Serenity

Serenity
Shag Joey (For obvious reasons!)
Eat pylon made out of fine nylon

Tristan
Spit at Yugi
Kiss Kaiba

Seto
Stop insulting Joey
Abandon his company

Mokuba
Kill his older brother
Hump a tree

Mai
Wear a long skirt (Seriously)
Wear Tea's school uniform

Bandit Keith
Play the recorder
Decorate his house

Pegasus
Clear out his tower
Wear a fluorescent pink tutu

Rebecca
Enlarge her breasts
Abandon her teddy

Duke
Kill off his game
Eat his balls served with onions and pickles

Malik
Play Monopoly (Unless it gave him a sadistic sense of power!) ^_~
Go bowling with Tea

Mariku
Date all the female cast of YGO
Sing hymns to God

Isis
Take over the world
Laugh evilly (Muahahahahahahahahahahahaha!!! Mr. Burns: Excellent -finger twiddly thing-)