Mike Huckabee's Fox News program uses a mirror placed next to the program's studio audience in order to make it appear as if far more people are in attendance.
In a segment on TBS' The Pete Holmes Show that was highlighted by media blogger Jim Romenesko, comedian Noah Garfinkel claimed that when he recently attended a Huckabee taping he noticed that “They have a mirror to make the audience look twice as big.”
Here is the mirror in question, from the November 23 edition of Huckabee.
In video from that broadcast you can see the mirror shaking as the audience claps in response to Mike Huckabee's joke.