. Pull his hair all the time.
2. Replace all his hair ties with fluffy pink ones.
3. Paint sparkly butterflies on everything he owns, and on him.
4. Throw food around in his kitchen until you can't even see the walls.
5. Tell Ryou that he poisoned the cake.
6. Actually poison the cake.
7. Put chewing gum in his hair.
8. Every day, sneak into his bedroom and hide a banana under his bed.
9. Keep doing this until he has a massive pile of rotting bananas under his bed.
10. While he's cooking, play really crappy music, really loudly.
11. Tell him you really really love mash potato, make him cook you loads and loads of it, then don't eat any.
12. Tell him that it was actually baked potato you liked.
13. Do this with every type of potato, then move onto eggs.
14. Dye his hair bright yellow.
15. When he makes a really big cake, hide inside it, then jump out at him.
16. Just before he's about to put his chef hat on, fill it with caterpillars
17. Call him "Happy happy smiley man."
18. Constantly claim that he fancies Ryou. (Whether you are saying this honestly or not is up to you.)
19. Ask him about his gender.
20. Find where he keeps his cooking ingredients and replace all the sugar with salt.
21. Ask him if he designed the café.
22. Randomly kiss him on the forehead.
23. Jump out at him while he's carrying stuff.
24. Insult everything he does.
25. Put green food coloring in everything he makes.
26. Throw pants at him.
27. Ask him if he's secretly a ninja.
28. Say "Wibble" to him.
29. Eat lots of sugar, tie your shoelaces together, then go into his kitchen and try to run about.
30. Push him in a river.