Knight's Quest 
"No, it's a hufflepuss!" the troll declares.  "Odd creatures, the hufflepuss!  They walk on all fours in the morning because they're a little groggy from waking, then get up on their hind legs in the afternoon, and then they usually stub one of their feet on a rock so they're limping on three legs by evening." 

"That's lame," you say. 

"That's what I'm saying.  They're lame." 

"I mean, there's no such thing as a hufflepuss." 

He glares at you and declares:  "THERE IS TOO!" 

"I am of the opinion," you say, "that the real answer is that it's a man." 

"Okay, okay," you say.  "Calm down.  You're absolutely right.  It's a hufflepuss."