Arms hanging out of windows

[Silver Ghia]

Have seen more and more drivers lately (lots actually) driving along with their arms hanging completely out of windows. This was highlighted this afternoon when driving over the Westgate bridge with its narrow lanes, a guy was cruising down the bridge in heavy traffic with his arm hanging down from the window, ready for another car to drift over and into it (remembering there was a thread recently on cars tending to drift into other lanes).

Besides being illegal, how stupid is this practice? I'm sure our members here have more sense.

Probably part of the current trend of driving while in a daydream, you're safe as long as you're under the speed limit. Oh yes, and in a car that is much safer as it has curtain airbags.