Your NES doesn’t like you cheating on it with Sega, and it made a song to let you know. This parody of Cee-lo’s song “F*ck you” was made by Inverse Phase, check out the rest of his Chip Tunes on his website.
“So what’s going on here? Well, the year is 1990. You’ve finally gotten a Genesis (or a Mega Drive, I suppose) from the toy store and your Nintendo has begun to collect a fair bit of dust. If it could talk (or sing) to you, what would it be saying right now?”
This is SFW
This is NSFW
[Thanks to my friend over at Areumu for showing me this]