"Q: Are there any SOAD songs that you don't like playing live, but your band mates insist on playing live?
A: Yes, but I won't tell you which."
Wich one do you think it could be?
Also, asked about unreleased Mez/Hyp songs like Hezze, he said "Hopefully one day"
You can read all of Serj's answers here http://www.reddit.com/user/serjtankianofficial