Off-the-wall

What kind of a harebrained, off-the-wall idea is that?

She is a very off-the-wall character.

What makes it surprising, though, are the glimmers of wit and self-awareness beneath all the rap star swagger and over-the-top confrontations. Even the fervid finale had a few off-the-wall side jokes.

All of their friends were amazed that they were familiar with a war hero. Some began to understand Chips' moods and drinking. His "off the wall" behaviour at times. And unknowingly they were "forgiving" him.