The positive follow-up to complaints, failures and ideas.
Complaints can be annoying, but when paired with solution ideas are valuable. Failure by itself is a negative but when it comes with honest learning is the foundation of innovation. Ideas by themselves can be worthless but when accompanied by follow-through can be worth millions.
Therefore, next time someone brings you any of these things alone, see if you can get the person excited to come up with the positive follow-up.