Insane is like a roller coaster. Em's flow is fantastic, and doesn't give you a chance to even breath. Since the song starts, you just follow the lyrics until the perfect conclusion. It's also shocking that for a song that's only 3 minutes long, there's so much variety and an interesting storyline. He does a different voice for the characters (son, mom and stepfather), and all of them are executed really well. The beat is fantastic, and does an awesome job complementing the twisted lyrics, so is the chorus.
Sure, the content may be questionable, but for what it is (a batshit fucked up insane song), it's absolutely fantastic. Love Insane.
"Did you get him? Naw the fucker tried to bite my face off,
I just got fuckin' chased off with a chainsaw,
then he took the chainsaw bit the fuckin' blades off,
ate the blades stuck a baseball in a slangshot,
then he aimed at his own face let the thang pop,
took his eye out picked it up and played pang-pong,
then he played pang-pong with his own dang dong,
that motherfucker's got nuts like King Kong"
. Always in my top 3 of Relapse. 
