Difficult to categorize is Andy Kaufman's Foreign Man character, who didn't understand comedy but was so enthusiastically inept that one couldn't help but feel bad for him. Anyway, his catchphrase was "Tannk You Veddy Much."
Barack Obama's "YES! We can!" It has also been used by several other democratic campaigns over the years. There is also the Spanish version (Sí se puede!).
Bruce Forsyth has a lot which all started on specific TV shows but which he then seemed to carry into everything else he ever did. Most famous are "Nice to see you, to see you... [Invites audience to say 'Nice']" and "Didn't he do well?". In recent times he has also adopted "I am not doddery, doddery I am... [Invites audience to say 'Not']" as a sort of self-parody.
"Follow me, I'm not gonna let you down." and "To the triumph!", Carlos Menem
And "Have you come far?", which is her all-purpose icebreaker.
Let's not forget "And what do you do?", which is an endless source of comedy for British comedians.
J.G. Quintel tends to say "Yay-yuh!"
Joe Elliott says "Don't forget us, and we won't forget you" at the end of every live gig.
John McCain's "My friends..."
"The people united will never be defeated!", Juan Peron
"My vote is not positive", Julio Cobos
Keith Olbermann's news cast is awash with catchphrases, from the opener ("Which of these stories will you be talking about tomorrow?") to the signoff ("That's Countdown for this the xxxxth day since the previous President declared 'Mission Accomplished' in Iraq. Good night, and good luck"), the last in Homage to Edward R. Murrow. In between there is "Worst Person in the woooorrrllld!!!" (which is another homage, in this case to Bob & Ray).
It shouldn't be possible for "Sir" to be a catchphrase, but somehow...
Kevin Meaney has "That's not right!".
"Thank you for your very amusing review. After reading it, in fact, my brother George and I cried all the way to the bank." - Liberace
Lloyd Robertson of CTV ended his lead anchoring days [1984-2011] with "And that's the kind of day it's been".
Michael Caine: "Not a lot of people know that" (actually a Beam Me Up, Scotty!- it's from a Peter Sellers spoof) and "My name is Michael Caine". Madness turned the latter into a hit record.
Toy critic Michael Mozart has a couple "Really!" and "What were they thinking!"
Nathan Fillion's "Bam, said the lady."
Paris Hilton famously overuses, "That's hot."
"Hello, Americans, I'm Paul Harvey. Stand by for news!"
"Now, page 2."
"Paul Harvey...Good day?"
"And now you know the rest of the story."
P.T. Barnum's catchphrase was often said to be "There's a sucker born every minute" when it was really "There's a customer born every minute".
Reggie Fils-Aime, president of Nintendo of America, seems to as of lately have made his memetic line "My body is ready" (originally said once during Nintendo's 2007 E3 presentation, and not mentioned again until 2012) into hisown catchphrase of sorts.
Ringo Starr, in keeping with his New-Age Retro Hippie image, signs on with the phrase "Peace and love, peace and love." This became especially hilarious when he put up his much-derided video update telling the world not to send him any more fanmail: "I'm warning you with peace and love."
The historian Robert Caro's epic Crowning Moment of Awesome, The Years of Lyndon Johnson has two that are used as themes throughout the books. The first, said by Lyndon himself is, "If you take care of everything -everything- you'll win." The second, said by one of Lyndon's childhood friends is, "He just had to win. Had to!"
Rodney Dangerfield: "I get no respect, no respect at all." As subverted in an episode of The Simpsons that he guest starred in.
Satoru Iwata always says "Directly to you" in his Nintendo Directs. (Though other Nintendo Direct hosts say this too)
Marvel Comic publisher Stan Lee: "Excelsior!" (This is the also the New York State motto.)
Thomas Babington Macaulay (who was very intelligent) was wont when he was a child to refer to some item of knowledge as "what every schoolboy knows".
Walter Cronkite [CBS Evening News, 1962 - 1981] ended almost every broadcast with "...And that's the way it is". He even carried it over to when he voiced a character in We're Back: A Dinosaur's Story.
Parodied BTW in Bruce Almighty with "...and that's the way the cookie crumbles."
And that's the way, uh-huh uh-huh, I like it, uh huh, uh huh.
The great radio broadcaster Walter Winchell (1897-1972) began every radio broadcast with "Good evening Mr. and Mrs. America from border to border and coast to coast and all the ships at sea. Let's go to press." He would then proceed to talk at 197 words PER MINUTE.
"AUSSIE AUSSIE AUSSIE!"
OI! OI! OI! (Interestingly, a Catch Phraseis mentioned on this page, but it has nothing to do with that little bit of responsive cheering.)
Chick-fil-a (a fast-food restaurant that specializes in chicken and is closed on Sundays) employees are required to say "My pleasure" any time a customer says "Thank you."
The newsgroup comp.sys.sinclair has many Catch Phrases amongst long-term regulars. From The Fast Show they nicked borrowed "I'll get my coat" (usually rendered as "IGMC") as a way to abruptly end a post. An even more abrupt (and usually euphemistic) ending is [NO CARRIER] or some variant. Then there's replying to "name this game" requests with "it's definitely not Stonkers", and responding to sundry remarks with "you said that yesterday"... The list goes on.
"God Bless America" was a popular speech closer among U.S. politicians. It's dropped off in popularity over the past several years, though.