• So I can start kicking butt faster - When I start a new job or a new contract. Or when I hack on a new feature. Or every day of my life as a programmer that involves legacy code. Yeah pretty much all the time.
• So I can learn new tricks - Healthy languages evolve. Idioms and slang are tools for more efficiently expressing ideas. I want to be on top of that. Also its best way to peak inside the mind of a talented developer and steal and copy their skills.
• So I can work better with others - I understand their idioms because I have seen them before. And I can probably articulate why their idioms are awesome or feeble.

I must remember that attitude matters. If I think of reading code as a painful chore it will be. But if I look for opportunity I find it.