Empty can or Full can?

So I heard this on radio:

An empty can and a full can drop test.
The empty can makes a higher pitched noise, whereas the full can makes a denser noise.
So, do you want to be the empty can or the full can?
Conclusion: empty cans make the loudest noise.

So what is this statement implying?

1. That humble people makes the most success, and people who are full of themselves (full cans) won't be able to do anything big. OR...
2. People who lacks knowledge always make the most sound pollution, whereas people who are knowledgeable tend to treat things in a more peaceful and quiet approach. (you know you know, the stuff happening in our beloved country lately?)

Not really sure what is Fly.fm's approach, but not bad. :)