Do you think you're rational? Are the decisions you make logical? How do you know? Have you ever looked back on decisions you've made and wished you had chosen differently? Probably. Everyone does sometimes, right?

The problem is our rational minds are affected by our emotions, our physical state and a whole bunch of social pressures. These unconscious parts of our mind can make us choose badly. It creates a bad decision making process, sometimes referred to as 'confirmation bias'. In life, it causes arguments, in business, it gets you screwed.

The other problem is, books about it can be pretty dull. Except this one, which is full of funny stories and bad language, just like the real world.

Screwproof is a laugh-out-loud funny, plain speaking guide to using simple thinking tools to help you make better decisions and negotiate better deals. It explains 5 simple rules that will stop you from getting screwed. It's got useful thinking tools like 'The Sandwich Guy test' and 'The Bad Waiter test' to help predict how well you'll get along with someone you're trying to make a deal with.

Screwproof is a way of thinking that makes sure your choices are coming from your rational brain, not emotions or social peer pressure making choices for you, written by entrepreneur and tech startup veteran Andrew Walker, based on all the deals he's screwed-up over the last 20 years.

It's been read by bankers, investors, civil servants, psychologists, entrepreneurs, geeks... it's even got people thrown out of quiet coaches on trains for laughing. It's useful for anyone who has to make deals, especially if they've got to think creatively and fast.

Don't get screwed, get screwproofed.