Personally, I get agitated depression or dysphoric mania. I never really experience textbook "depression", and I can't recall a time that I did. (I'm sure I've experienced it before, but I just don't remember.) I'm very physically destructive when I'm depressed. I'm a raging a**hole and everything irritates the hell out of me. So, I know it's not a "normal" depression.

Based on my own experiences, I think bipolar depression tends to have some agitation involved. Not always, but tends to. Lots of irritability, impulsive behavior, anger, rage... I think it's normal for a regular depressed person to feel irritable, but I don't think they experience full-on "rage" or impulsivity.