Well, a casual search of the boards reveals that I have not yet waited 500 seconds, so I’ll just dive right in:
hither, thither, & yon
here, there, & everywhere
lock, stock, & barrel
hook, line, & sinker
this, that, & the other
yours, mine, & ours
Peter, Paul, & Mary
Tom, Dick, & Harry
—See? Any more?
Kirk, Spock and McCoy
Me, myself and I(rene)
Red, white and blue
Igneous, sedimentary and metamorphic
Larry, Darryl and Darryl
Tinkers to Evers to Chance.
Spahn, Sain and pray for rain.
Larry, Moe, and Curly.
Superman, Batman, Wonder Woman
The Father, The Son, The Holy Spirit
Screwed, blued, and tattooed.
Huey, Dewey, and Louie.
Yesterday, today, and tomorrow.
Man, woman, and child.
Bacon, lettuce, and tomato.
Signed, sealed, delivered (I’m yours). 
Corinthian, Ionic and Doric
Lions, tigers & bears (oh my!)
Positive, negative, and neutral
x, y, and z (axes)
ice, water, and steam
Rock, paper, scissors
Live, long, and prosper
Past, present and future
Deaf, Dumb and Blind
Lies, Damned Lies and Statistics
Tinkers, Evers, and Chance
Mrs. Who, Mrs. Which, and Mrs. Whatsit
Yes, no and maybe
Yes, no and I don’t know
Right, wrong and indifferent
Wynken, Blynken and Nod
Porthos, Athos, Aramis and D’Artagnan
Hart, Schaffner & Marx
Kukla, Fran & Ollie
Win, Place & Show
Raise, Call & Fold
Win, Lose & Draw
Wham, bam, thank you ma’am.
Dewey, Cheatem, and Howe
Papa Bear, Mama Bear, Baby Bear
the Butcher, the Baker, the Candlestick Maker
Chico, Harpo, and Groucho (and Gummo and Zeppo).
Animal, Vegetable & Mineral
Lambert, Hendricks & Ross
Ready, willing and able
Going, going, gone