I got a couple of chuckles out of this video, not bad. :P
As well your lip-sync skills are pretty good.
I will suggest a couple of things though that could help improve the quality of future videos, or even this one if you ever decide to remake it.
-Most of the video is reliant on the voice acting and animation to get the joke across, which was still effective enough to work. However adding some simple sound effects for things like yanking the snake out the ear and plopping to the ground will make the video less silent.
-If it weren't for the obvious copyright reasons, and it was a song of your own creation, I would suggest having it playing super quietly while it was still stuck in his head.
-The joke was entirely character centric, but adding in a background sometimes adds to the quality of a video. A room inside a house or walking around town etc.
No marks were deducted from the total score for this reason though.
Keep up the good work and you'll surely improve.
Good luck!