New game! What was the worst thing Michael Scott did?

I saw this on another subreddit and considering the lunacy of the office I thought it'd be super cool to give this a try!

Instructions: 1. Every day I'll give a new character 2. Comment what the worst thing they did was in the entire 9 season. 3. Please no repeats! Upvote comments that are the same as yours 3. Top 3 comments will win!

Starting off, of course, with Michael Scott!