Mr. Brick, you must be in Brazil hanging out with FRM again.
Here's a copy and paste from less than one minute ago from the YT page:
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Published on Jul 22, 2015
The manual focus ring is not as smooth as it should be. It also makes some screeching sound and feels like metal rubbing up against metal when the focus change is a larger distance.
Category
Pets & Animals
License
Standard YouTube License
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Bob Jackson
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Bob Jackson 1 day ago
The noise it's making is its way of screaming at you.
I use less force racking a shotgun than you do on that lens.
Go easy on the equipment man.
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TGB1951 5 hours ago
Why are you forcing it past the focus stops? That's abuse!
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I also find it odd that it's listed under "Pets and Animals".

It also shows at "unlisted", which it didn't used to.