Dragggggged on......
Definitely the very very ending was the funniest part.
That's all nice and well, but there was WAY too long of a set up with repetetive joking after another. Cut to the chase next time :D
Also, I'd say burhs up on animation a little. Have the guy turn his head to look at the spider. Change 'camera angle' occasionally, do close ups of characters (You do this once at the end, but that was only to hide the extra arms), etc.
I'll let you off easy, since the ending actually did make my smile.