Messing with the fans doing "WHAT" chants during his Wrestlemania XXI interview with Steve Austin ("Try to keep up with me!"). Plus, he fires off this great line:
Piper: I was pissin' Vince McMahon off when the red on the back of your neck was diaper rash, buddy.
During a run as Vince Macmahon's Dragon in 2003, the chairman tears a new one into Piper for failing to take down Mr America (aka. Hulk Hogan) before giving him a disrespectful smack to the face. When he tries it again, Piper blocks his hand, and sincerely apologises, though adds if he ever touches him again he'll rip out his THROAT!!!. A furious Vince takes that challenge and the two seem genuinely all set to tear each other apart before they are broken up.