I watched the excellent documentary, Catfish. The sound was done by Coll Anderson.
There's debate as to whether or not it is real. I wonder if we can tell from the sound if it is or not.
[spoiler alert]
When they are meeting the family, which supposedly do not know that they are filming, they all sound decently miked. This means (I think) that they would either see a boom or have had a radio mic put onto them...
Any thoughts?
ps: this is an after thought, I would need to watch it again to make sure.