Too many to count. Walking into just about anything and falling down - one runs out of plausible excuses after a while. A permanently messed up knee from skidding it open on concrete so many times. A few good blows to the head from falling off more than one bar chair straight backwards. A black eye the day before a huge presentation. A broken tailbone. A nice scar on my chin from slipping and catching it on the corner of a desk. Many, many more. Uuughhhhh.