It happened only once for me.
I was in US team. We hid our smoking humwee near the wall, dismounted and started to run. I turned around into the wall and I could see the sparkling/smoking (sprite only) of the humwee though the wall.
I tried to take a screenshot but for some reason it didn't save in screenshot folder.
This is where we were parked it.
This is some random screenshot of C.S 1.6 wallhack. So that's how I saw the smoke from the humwee. You get the point.
