Well, people think they cannot miss out and need to do it - because their competitor does it. You'll see the same with world cup advertisement in a few months. Most of it is crap, rising above the crowd is hard.
On the other hand, there are some clever things that sound like jokes, but are not: http://stroopwafel.me/
I would like to see an ad that is just plain text "We donated the $250k production budget for this ad to Haiti" and a logo. That is far more likely to make me give a company my business than any stupid pointless video clip.
On the other hand, there are some clever things that sound like jokes, but are not: http://stroopwafel.me/
Well, I for my part have my share of fun.