Which is correct "Look at what I found." or "Look what I found." The former has always bothered me, but I'm not sure what the grammar rules would say.
It is an idiomatic usage of "look" which is generally used without the preposition "at" when you are telling someone to be careful and it is followed by "when, where, what and who:"
- [ I ] used when you are telling someone to be careful or to pay attention:
- [ + question word ] Look where you're going!
- Look at the time - we're late!
- used when you are annoyed with someone and want them to look at the result of their action
- Look what you’ve done! The chair’s ruined now.
Simply, "look at what I found" is asking to look "at" something the first person has found. "look what I found" is asking just to have attention.