I say "moment" instead of song because I think we'd all agree that he was at his best when he had his own "verse" as opposed to full song. But I'll certainly entertain any of his great songs, too.

Anyway I submit (as I did above) Xxplosive. Specifically "don't wanna treat ya wrong ..." and everything after. Ohhhhhhhhhhh baby. I get chills everytime.

https://youtu.be/WdlyIH2DX60?t=80

That said, now that I just listened to his part in Deeez Nutts I may have to reconsider. Deeez Nutts may be a close 2nd.