Jack Nicholson's character in "As Good As It Gets" is a good example of an O-C who is a Routines and Rituals (note the way he puts on his slippers) and also Germaphobia (which I thank God I don't have). Counting is one I have, though not to the extent of the TV character Monk, who also has a Symmetry compulsion, Germaphobia, and is a Neat Freak (which isn't the technical term, but I digress). These shows are pretty good depictions of OCD.
On a side note, there's a difference between being Obsessive-Compulsive and having an Obsessive-Compulsive DISORDER. In the second case, it interferes with the ability to lead a normal life. I actually got in trouble at work tonight because of my OCD. Normally, I can function alright within the bounds of my brain's programming, but tonight, I broke a rule because I HAD to.
The Compulsions aren't just weird habits, I HAVE to do them. Even when there's no rational reason for it, even when I KNOW there's no rational reason for it, my brain is wired that I CAN'T not do it, usually. Sometimes, I can resist a Compulsion, but I ALWAYS feel like I've done something wrong when I do. Tonight, I couldn't resist.
Sorry this got so long. Overexplaining is another one.