you might say: WE were wrong, but I was wrong.
Where were you last night. I was with my friend.
Maybe: I was mistaken.
You think your own thoughts about that picture. Your interpretation seems rather Dark.
We have an expression for things that are made in a rather haphazard manner. Heath Robinson.
Here is an item about Heath Robinson:
W. Heath Robinson - Wikipedia, the free encyclopedia
Fire balloon - Wikipedia, the free encyclopedia