I'm posting this video here because it features famous quotes being said by other seiyuu!
main ones:
Kyousuke from Oreimo (who sounds like Aogami?) saying the most known version of sogebu (originally said to Izzard; "Okay... if you think you can do whatever you want, then I'll rip apart this screwed up illusion!")
A girl from Oreimo saying (part of) the famous quote from Accelerator (originally said to Amai Ao; "No matter now many excuses we put forward, those can't be the reason to kill this brat!")
and finally it's not a quote but Accelerator presents Oreimo and that's just awesome ;D
"Index no Index da yo!"