Naruto could enlist the help of his friends like Shikamaru. Shikamaru could come up with a really elaborate plan. For example, they could set up a fake mission where Ibiki thinks he's in charge, but it's all just a setup for a series of pranks. They could have actors pretending to be enemy ninjas who act really silly instead of being threatening. And Naruto could keep popping up in unexpected places during this 'mission' to further annoy Ibiki.
No, it is completely unethical. Any sexual activity without the explicit and conscious consent of all parties involved is unacceptable. Sleeping individuals are not in a state to give consent, and engaging in sexual acts in such a situation is a form of sexual assault.
Sakura's reactions can vary. Sometimes she tries to get revenge on Naruto for his pranks. If he plays a prank that makes her look silly in front of Sasuke, like the fake love letter prank, she'll be really mad and try to think of a way to make Naruto pay. Sasuke might pretend not to care, but if the prank affects his image too much, like the hair product switch, he'll give Naruto a cold stare. Kakashi is more laid - back and just watches the whole thing unfold like it's entertainment.
Well, stories that have a slow pace and a comforting plot work well. Maybe a story about a sleepy town or a friendly animal's quiet adventure. They create a tranquil atmosphere that helps someone drift off to sleep.
One of the funniest pranks could be that the Kyuubi makes Naruto's clones start singing cheesy pop songs instead of following his commands. Naruto often uses his clones in battles and for various tasks. So when he sends them to attack an enemy, they all start singing and dancing instead. This would not only be a shock to Naruto but also to his opponents. Another great prank would be the Kyuubi making Naruto's body move in the opposite direction of what he wants. So when he tries to jump forward, he jumps backward instead, leading to all sorts of comical situations.
Well, there's a fanfic where they prank Carlisle by making his office look like a disco. They put up disco balls, flashing lights and played really loud disco music. It was hilarious. Also, the prank where they switched Rosalie's beauty products for really cheap and smelly ones. Rosalie was so angry and her reaction was quite memorable.
It's not ethical at all. Our bodies are our own, and no one should be able to administer any drug to us without our knowledge and consent. In a story, if such a thing is presented as acceptable, it sends a wrong message. This act can lead to various problems like loss of consciousness against one's will, potential harm to the person's physical and mental state, and is a blatant disregard for personal boundaries.
Most of the time, Rainbow Dash's pranks are in good fun. With ponies like Pinkie Pie, her pranks can strengthen their relationship. Pinkie Pie loves a good laugh and would probably find Rainbow Dash's pranks hilarious. They would bond over the shared humor and it would make their friendship even closer.
Peter could play a really funny prank on the Avengers. He might use his agility to secretly attach some helium balloons to Captain America's shield. So when Cap tries to throw it, it goes all wobbly in the air because of the balloons. And for the Hulk, Peter could create a holographic image of a really cute kitten right in front of him. Since the Hulk is usually associated with destruction and anger, seeing a cute kitten would be a really unexpected and humorous situation.