First of all, I don't often recognize my hypomania until its too late. It overtakes me and usually involves thinking irrationally about moving into the woods, rapid speech and talking over people, blaming the world for my problems, and then it ends with fits of anger and paranoia.
The worst thing I've done involved a wall in my garage. First, I decided to take a hockey stick to the sheetrock, driving four blade sized holes in the wall before stopping. It was a Sherwood so it could take the punishment.

Then I punched a hole in the wall like Andy Bernard from The Office. I like to tell people he learned that from me.
Thankfully, the violence against things that don't fight back has gone away. But I still suffer from rapid speech and blame. The anger is moderate and less frequent but it's still there.