For that to occur, it would have to be something called a "Forced Perspective" shot, and to do that, the bottle would have to be of a significantly larger size to appear the right size. Similar techniques were used in the movie "Attack of the 50 foot woman" with Darryl Hannah. But, I digress.
There was a stick there but I think the reason for it was, balancing the bottle just on the guy's head would cause a constantly moving target with a fairly high potential of just falling off. Also the guy had his back up against the pole. He had to be leaning against it to be able to remain as still as he did. His reaction afterwards was brushing the now quite numerous tiny glass shards out of his hair. Its just a case of blatent stupidity.