A small, fully impromptu, Q&A in which you answer the questions of all participants at a table.

This is a take on the Perforated Q&A: achieved with a single move, it contains several convincers disproving the method as well as a built-in finale.

[Note that this effect is unlikely to end up in your next walk-around set: it requires a table and has a set-up phase during which participants write and their papers are collected.]