crazy as a loon

You might be crazy as a loon or you're better, but there's an evaluation.

I remember the day he said that to me, I thought: “Yeah, but he’s crazy as a loon!”

“Meanwhile, I was crazy as a loon myself.”

“Say all you want to about Trump — he’s crazy as a loon, no question about that — but at least he’s trying to do the things he promised people he was going to do. Whether it’s right or wrong or in between, I don’t know.”

Mrs. Borkowski was as crazy as a loon.