Reading Documentation Effectively

I guess that I wanted to prompt a discussion on how people should read documentation effectively. It's a skill in itself and something that took me a long time to really figure out how to do.

• How do you read docs?
• How much of the docs do you actually read?
• Do you have a set process?
• What makes for a frustrating reading experience?
• What are the best docs that you've come across?

I put down my thoughts on this here