Capcom just posted this up on their blog, an adorable kid bopping his way through the Mega Man 2 and 3 themes while fending off a little brother.
I'm surprised this video didn't end in tears, as it would have had I tried to pull that with my older brother... I totally would have too.
Adorable Kid Sings Mega Man 2 and 3 Themes A Capella [Capcom Unity]