What is it?

Dennis' constant greeting,"Helllooooo, Mr. Wilson!"

"Oh, Fiddle Faddle"

For many episodes early on Dennis used to alway say "Jeepers".... On the episode "Man of the house" season 2 at the very end they flip roles and Mr. Wilson says "Jeepers" after Dennis says he sounds just like him....

My favorite saying is such a favorite that for years I've said it myself whenever the situation calls for it. I imitate the first Mr. Wilson just the way he says: "OH GREAT SCOTT!" Most people don't even know I'm imitating Mr. Wilson they just think it's my own quirky way of speaking.;)

My second favorite phrase is another one I imitate whenever the occasion calls for it, I will say just like the second Mr. Wilson, Gale Gordon, says "OOOH NOOO!" in the same voice expression. I guess I do these things mainly as my own private joke.