If you're tempted to say anything like that initial clause, resist it."

Can you please complete and initial clause two, sign the documents and return them to me for signature here.

The initial clause, "Happy those early days!", plunges us into the middle of a discourse, as much lyric poetry does.

It is also said to occur when a main clause is left unsaid due to a speaker interrupting him/herself to revise a thought, thus leaving the initial clause unresolved, but then making use of it nonetheless by recasting and absorbing it into a new, grammatically complete sentence.