No source work, performer or origin is documented for this clip, so it is not attached here to a film, show or character. The wording itself is the recognisable part: 'I wish I knew' is a common everyday phrase, and as a short standalone clip it can be reused in different videos without extra context. That makes it a flexible reaction sound for edits that look back to a missed chance, an unanswered question or a decision already made.