1. GET BENT! (never gets old) 
2. Yukiko saying "You're wide open!" when scoring a crit (no one ever said anything about it, but every time i heard her say it i repeated it and laughed to myself) 
3. Aha! Is this our chance? (who wouldn't love this line?) 
4. I looooove them balls 
5. everyone still referring to Morooka as "King Moron" even after he was brutally killed 
6. You have welcomed Satan into your heart. 
7. I'm Jack Frost, ho! 
8. Anything and everything Funky Student says 
9. the "voices" of Ghoul, Black Frost, or any other persona or character 
10. when Kou and Daisuke have to clean up in the gym, having the option to "help out" or "be an ass and leave."