Whoo! Last weekend I joined in with my class via Skype to take part in the 24hr Comic Day that was organized by my school.
To set up a challenge for myself I decided to draw with my left hand, using charcoal and working on A3 format. I only got up to 16 pages - drawing with your opposite hand does slow you down, but the story was pretty much finished anyway. It was lots of fun even if it ruins you the day after :p I'll be sure to join in again next time!