Yugi
1. The main thing you could do is take grandpa.
2. Kill his friends.
3. Say to him jeepers creepers where did you get those peepers expect him to wear sunglasses.
4. Cut up his colthes.
5. Give him a perm his hair is lovely straight believe me i know.
6. Take away his gel.
7. Hide his puzzle then give it to Bakura.
8. Take the Dark Magician from his deck.
9. Tape his eyes shut you will need 10 rolls of tape / that was mean sorry Yugi but i had to/
10. Cut his hair.
Yami
1. Give him a neckless that says Bakura.
2. Send him spandex.
3. Write i love Kaiba on his puuzzle.
4. Tell him Marik should rule EGYPT.*because i love the Mariks*
5. Die his hair hot pink.
6. Defeat him and take over the world.
7. Ask him why he loves Bakura.
8. Tell him he have to marry Tea which will scare anyone.
9. Turn him into a woman.
10. Rob his tomb.
Now Yugi crying and Yami is fruming.