Because my mom included the song in her first video project, and there's a copyright claim on that song by Gilbert Gottfried, for some reason.
Well, again, he doesn't own characters that are legally the property of a mega corporation that's very protective of its characters and properties, like Nintendo, so really, he shouldn't be monetizing videos using copyrighted characters - that's infringement no matter how you look at it. I don't monetize my MORON LEAGUE videos, even though they should fall under Fair Use because they're parodies, they're still copyrighted characters that I don't own, and knowing what a notorious copyright bully Warner Bros. is, I'd be asking for trouble trying to monetize.