A quick-fun story. My (ops-but-sometimes-writes-scripts-to-help-out) coworker just tapped on my shoulder and asked me to look at his code that wasn't working. It was a bit something like this: User.includes(investments: -> { where(state: :draft) })... This is not a feature of ActiveRecord or any libraries that I'm aware of. I asked him why he thought this was valid syntax, and he pulled up his ChatGPT history.