I wouldn't call it clumsiness. I just have a tendency to delete certain information that would prevent accidents because I see it as being unimportant. Like the fact that there's a bookcase directly behind me where I sit at my workstation. I get up and turn around (heading into another room) and usually walk right into the pointy corner of the short bookcase. Then I get nagged about how thoughtless I am. There have been other incidents. There's a set of cabinets that hangs above a "bar" (countertop similar to those found at taverns) in my apartment and I've been known to walk straight into it, especially when I'm wearing a cap with the bill forward.
I feel it's always the most embarrassing to stumble about in your own home where you should be accustomed to the layout.
My girlfriend is clumsy and unbalanced. She's always telling stories about some accident she's been caught up in. Her balance is so lacking that you can nudge her head with your pinky and she'll stumble around trying not to fall. It may have something to do with her lack of differentiation between right and left. BTW, how many people do you know who to this day don't know their right from their left? It boggles my brainium (made up word)!