Is the dialog in the One Piece opening unique? In the latests one piece opening (opening 17 Wake Up) At around the 1:27 mark of the opening there is a short dialogue between Blackbeard and Luffy, with our Straw Hat hero telling Blackbeard it is him who will obtain One Piece and be the Pirate King!

Is this a unique feature made by One Piece just like their long openings instead of openings and endings. Or has it been used before/ is it more common to add a piece of dialog in between the opening of a series.
This is unique in this opening

There hasn't been any opening before with text between two characters. I've seen every opening and haven't seen it in earlier openings, that being said I don't know every ending of OP so I don't know if it was used in those before.

The piece of dialogue is just flavor, nothing more nothing less. It isn't shown anywhere in the anime or the manga. This is probably just to spice up the opening and set a premice for the opening battle that follows suit.

If any other anime did this please let me know or correct me but I haven't seen it anywhere before, but I haven't seen every anime so I can't say