Is “I am” the shortest English sentence?

Dear Cecil: A page of fun facts making the rounds says “I am” is the shortest complete sentence in English. Can this be true? Jim Kepler, Chicago

Cecil replies:

No.

You object: “No” isn’t a sentence! A sentence needs a predicate!

Oh, OK. Ready?

Go.

You object again: That’s cheating! The subject is only implied! Who could possibly call that a sentence?

Yeah, right, you say. And we’re supposed to just take your word for it?

Cecil Adams

Send questions to Cecil via cecil@straightdope.com.