Ask the audience to divide the paper in half. We must act with one hand - without scissors! Hardly anyone on it will be decided if you would like to add that, and time is limited, say, three seconds.
And the solution is simple. Expanding the newspaper, ask your team to get the index finger in its very center. (To be sure, you can mark it with a dot.) Only to beat Porsche. And really, if you pull unfolded newspaper (but be careful not to tear it), and the audience will surely comply with your instruction, then in one instant, the sheet will break into two identical parts.