That's an interesting theory. I used to have a CB radio some years back and would listen to the truckers. A scrappy foul-mouthed bunch, by and large I felt that most of them were just hard working souls trying to make a living. I was, however, sometimes disturbed by the downright venomous hate some of them directed at 4-wheelers (and occasionally each other). It was somewhat understandable, given the atrocious driving habits so many knucklehead car drivers display on the road, but disturbing nevertheless.

A professional driver would surely be aware of the dangers this particular situation presents, and I guess it shouldn't be surprising if a few of them would find this stunt amusing. That smile you saw on his face is worrisome.

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2002 E320 4-Matic
2008 Subaru Outback
2009 Subaru Forester