This isn't exactly the same thing but it was pretty funny...
A few years ago I was helping a filmmaking friend of mine shoot some scenes for a film he was working on. In the scene the protagonist of the story comes over a small hill on his father's farm and to see the main house, with several police cars around it and cops arresting his father and older brother.
The film crew (boom mic guy, slate/continuity guy, camera assistant, and myself) was placed up on the hill with the protagonist and the shot started off on the him to show part of his reaction then panned and dollied (lateral movement either left/right or forwards/backwards) to show the scene near the house the younger brother was reacting to.
The director (my filmmaking friend) was down the hill with the cop cars, about half a mile away from us and we had two-way radios to communicate. Thing was, there was a good wind that day, we were downwind of the guys with the cop cars and their conversation carried all the way up the hill so whenever the director told his radio guy (an assistant director) to give us a direction or whatever, I'd repeat what he said just as he came over the air because the director was telling the people he was with by the cop cars first. It was really messing with them.
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AD: "I'm going to have them start wi..."
DP, interupting: "You want us to start out with a shot on Chris (the actor) as he's walking over the hill to get his initial reaction before panning over to reveal you guys getting cuffed, got it."
AD, confused: "How'd you know that?"
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Later, when we shot close ups of the guys with the cop cars, the director asked me how I knew what they were going to say and those of us who were on the hill just busted out laughing.
Some of the gag is on tape and film too.
When you get opportunities like that, you GOTTA take advantage of them. =)
