Olmy's Jart writes "According to this article on money.cnn.com, a judge has ruled that graffiti, the one stroke shorthand used on Palm Pilots, infringes a Xerox patent for "unistrokes". Really light on details and no links to betters sites, unfortunately." MSNBC also has the story.
If it happens once, it's a bug. If it happens twice, it's a feature.
If it happens more than twice, it's a design philosophy.