Robert Cialdini is rightly praised for his work Influence: Science and Practice (5th Edition).

Cialdini has trenchant obsersations how seemingly irrelevant features of our social landscape determine much of our choices.

We are familiar with the parlor trick- 3 people conspire together & look up at something in the air.

All in an effort to trick passerbys to join us -in looking at nothing.

Punch as a great variation on this theme!