One scene I find very humorous is when Luca pays his respects to the Don at Connie's wedding. Not only can't Luca spit out the words but the cutaway shot to the Don's face while Luca was talking was a pisser.

I also liked the scene where Michael ground up Carlo, getting him to crack about Sonny's murder. Classic Michael, Carlo never saw him coming. "Carlo, you grew up in Vegas, you are going to be my right hand man there." Keep your friends close, keep your enemies closer.
Clemenza..."Hello Carlo"

"This is the business we have chosen."