So like, at first he was all "killing is wrong" but right now I'm in the 7th mission and I think he got the taste for blood. He is a total maniac! Killing cops and talking to himself saying stuff like "Do you know why I pulled you over?", "license and registration, please.", "I've been drinking! I've been drinking!"
Bottom line is: Groove scares me.

Given the right circumstances, anyone can go mad :)

Second Mission (Groove still a bit prissy):
Taurus: "Hit the jump straight, real straight, you dig?"
Groove: "JUMP?!?!!?"
-Jumping starts-
Groove: "AAAAAAALLLLL RIGHT!!!!"
Lol...

More like hit the jump while steering full left or right and tapping the park brake a split second before, am I right?!