This isn't the only time he's shown he has a fun side either.
How to use your wand: Part one Hermione was in the bath and heard a knock at the dorm door, so she got dressed into a shirt and panties, and answers it.
Moodie may have his bad days, but this is totally not worthy for an Order of the Phoenix member, unless he's being controlled by Barty Crouch Jr.
The scene in question was very brief, and the false Harry and Hermione were surrounded by dark mist from the waist down and plenty of other special effects.