Storyboarding...

My animation will commence with lines that appear little by little, creating the nasal area.

Then for the philtrum, and begin the lips.

Then to complete the face the lips are formed. This process will all be done by stop motion animation by drawing the same line a little longer at each frame.

So the music will commence, with a long tuba note at the begginning of the clip the moustache will slide in smoothly.

Then move much like a caterpillar, crawl across the frame. 

Start to curl up and bend due to the change in the pitches of the trumpets and trombones.

The moustache crawls on to the mouth and starts to wriggle like it were alive and the man is finding the whole experience distressing.

The moustache curls up tightly building up tension.

Then the moustache straightens itself out sharply due to the long blast of the trumpet.

The mouth of the man start to laugh thinking that he has his 'moustache' under control.

How wrong he was, the moustache wriggles more and more and rips off his upper lip. It has other plans...

It's off this face, it starts to vacate and crawl off the face.

And dies down as much like the music...