It was a miserable season for Manchester United.
They relinquished their title, watched rivals Liverpool and Manchester City fight it out at the top, recorded their lowest finish since the formation of the Premier League and missed out on European football.
But they did learn some valuable lessons, including never to put a banner up at Old Trafford for someone who hasn't earned it.
Here's a list of 10 things we learned from United's season.
Feel free to use the comments section below to add what you learned.