Just wondering if anyone else ever just loses motivation and gets kinda depressed suddenly?

I'm not talking emo "cut myself" depressed, but more like "D*mn I wish someone would beat the sh*t out of me" depressed. For no reason what-so-ever! Life is good and I can't really complain about anything. I got enough money to make ends meet, a nice car, a family that loves me, a decent heading in college, and I just got promoted at a job where I basically don't do anything for good pay. Maybe it's a way of telling myself that I haven't really done anything with life. I dunno, just every now and then my mood drops like a rock for no reason and I get like this. It sucks.

Anyone else go thru this crap?