You rock out loud.

i have nothing to say.

Might have been funny.

Okay, so it's a story based on a one-liner. Those aren't easy to pull off. Perhaps if you had written this as though it would be a serious piece (ie making it the same length as a story) and finally ending abruptly with the joke, it would have been funny.

Though I hate to sound repetitive, I really think this should have been marked up as humour or parody. If it was meant to be something of a parody, then possibly you should consider extending the piece? What have is a little short and somewhat confusing.

At the very least tag this as humour please. Though I, for one, fail to see the joke.