Warning: Attempting one or all of these can and will result in a painful death (except for Unohana).
Mayuri Kurosutchi
1. Look over his shoulder when he's doing an experiment and continually ask "Whatcha doin'?"
2. Sleep with Nemu.
3. Mess with his chemicals. See how big an explosion you can make!
4. Tell Yama-jii that he's creating an army of mutant socks to take over soul society.
5. Set fire to his coat.
6. Steal his regenarative serum.
7. When he's fighting a hollow, continually heal it with the serum.
8. Ask what happened to his ears (it's true, he has none!).
9. When he's explaining something, walk away.
10. If he doesn't notice you left, film him talking to himself and sell it to the other captains.
Unohana Retsu
1. Tell her the reason 11th squad members are afraid of her is because she's hideously ugly.
2. Run to her every time you get a papercut or bruise, say you have a 'life-threatening illness'and must be healed.
3. Bully her squad members.
4. Tell her that one of the prisoners in the shrine of pentinence is injured. When she goes to investigate, lock her inside!
5. Insist her squad is a waste of space.
6. Tell her Orehime is the best at healing wounds, not her.
7. Cut off her hair.
8. Tell Yachiru that Unohana's plait is made of sugar, then sit back and enjoy.
9. Swap her sword with Zarki Kenpachi's. How long will she spend trying to release it?
10. Use her zanpakuto's released form to give people tours of Seireitei. No risk here!
Byakuya Kuchiki
1. Show his fangirls where he is.
2. Call him Byakukuku!
3. Trample on his expensive scarf.
4. Say that since his luitenant is a loser, he must be too.
5. Tell him Ichigo got Rukia pregnant.
6. Remind him that he lost to Ichigo.
7. When he releases Senbonzakura, loudly state that pink is the colour of gays.
8. When he's walking, jump out in front of him and start dancing in front of him.
9. Make him hold a sign saying: 'I lost two out of the three fights I've fought."
10. Get some chains and tie him up while he sleeps. Then, hang him up and let people pay to throw mud and him.