and worst of all, at that time their burger wasn’t much bigger than a White Castle and bun was huge
Really Good Advertising Jingles & Slogans
You said Slogans, are you changing it to Jingles only now?
You even said-
So, which is it?
Good Jingle.
As for a catchy Jingle, since I guess slogans are out???
4oz for Wendy’s.- less than an oz for White Castle- they get 18 patties from a pound.
The burger patties are actually very small, just 2 ½ inches (6 cm) square . One pound (450g) of ground beef will make 18 of White Castle hamburger patties. Each burger has five holes in it.
So Wendy’s is four times bigger.
“Stuck on Band-Aids/cuz Band-Aid’s stuck on me” is brilliant and fits the theme of this thread. It applies to the brand, forever, and is not tied to any sort of “you had to be there” situation.
Just please don’t list all of the commercials and ad campaigns through life that have amused you. That’s not what I’m going for here. “Where’s the beef?” tells me as much about Wendy’s hamburgers as “Clydesdale horses” tell me about Budweiser. Iconic for sure but not the same as “Think outside the bun.”
Pure simplicity, Mazda’s “Zoom Zoom” told you they weren’t concerned with how many grocery bags could fit in the back of their cars as much as they were interested in making a car that was fun to drive. I’ve found that to be an accurate description of their cars.
On the same note of jingles, what about the absurdity of the intros on radio stations? I will always default to looking for Magic 106.7 on a new radio because of their jingle I heard throughout my childhood sticking with me.
Remember the feminist anthem for Virginia Slims?
You’ve come a long way, baby,
to get where you’ve got to today.
You’ve got your own cigarette now, baby!
You’ve come a long, long way!
Yep, you can now stain your teeth, ruin your skin and nails, make your hair, breath, clothes, and apartment stink, get emphysema, and die of lung cancer just like American men! 
Trivia: it was written by Barry Manilow.
He also wrote:
“Like a Good Neighbor" for State Farm, and “You Deserve a Break Today” for McDonald’s
I kinda liked this one back around 1966:
The youth of America is fighting for you.
Buy Bonds where you bank or where you work----they do----
and follow the eagle----the red, white, and blue eagle!
Buy a share in Freedom----US Savings Bonds!
Accompanied by cool scenes of Hueys blasting targets in Vietnam. Good, clean fun!
This recruiting ad was good too:
They took the blue from the skies and the pretty girls’ eyes,
and a touch of Old Glory too,
and gave it to the men who proudly wear the US Air Force blue!
The US Air Force blue!
Didn’t Manilow also write
It’s the Pepsi generation,
comin’ atcha, goin’ strong!
Put yourself behind a Pepsi!
If you’re livin’, you belong!
You’ve got a lot to live,
and Pepsi’s got a lot to give!
Also ca. 1968:
Hey, meet the Swinger, Polaroid Swinger!
It’s more than a camera, it’s almost alive!
It’s only nineteen dollars, and ninety-five!
Pick it up (yeah, yeah), take the shot (yeah, yeah),
tear it off (yeah, yeah), count it down (yeah, yeah),
peel it off!
and
It’s the Radial Age!
Now the world is safer on a great new tire!
It’s the Radial Age!
BF Goodrich boosts your mileage so much higher!
New tire from BFG, the Radial Nine-Nine-Oh-Oh-Oh!
One ride and you will see
it rolls like nothin’ that you used to know!
It’s the Radial Age! It’s the Radial A-a-aaaaage!
What can I say? I grew up in front of a television set!
Oh, I’d love to be an Oscar Meyer wiener,
that is what I’d truly like to be!
'Cause if I were an Oscar Meyer wiener,
everyone would be in love with me!
Oh, I’m glad I’m NOT an Oscar Meyer wiener,
that is what I’d NEVER want to be!
'Cause if I were an Oscar Meyer wiener,
there would soon be nothing left of me!
One I remember from Saturday morning cartoons. It was for Good-n-Plenty candy, and featured Choo-Choo Charlie operating a train engine and singing his part:
Charlie says,
“Love my Good-n-Plenty,”
Charlie says,
“Really rings a bell,”
Charlie says,
"Love my Good-n-Plenty,
Don’t know any other candy that I love so well!"
It must be a really good jingle if I can remember it close to 60 years later.
"It’s Slinky, It’s Slinky!
For fun, it’s a wonderful toy!
It’s Slinky, It’s Slinky!
Fun for a Girl and a Boy!"
Yeah. For about 5 minutes. 2 if you didn’t have stairs.
Otter Pops
“There’s an otterly fantastic place
Waiting for you in otter space
So come with us in our ottermobile
There’s an ottermatic shift on the steering wheel
And you can fly
Otter Pops! Otter Pops! You get ‘em at the grocery store!”
New York Life Insurance: “The Company You Keep.” (Sadly, they replaced that with the inane “Be Good at Life.”)
Responding to @jaycat.again; copy function went haywire.
From National Lampoon, “Letters from the editors”:
“Hey, I’m Buster Brown, I live in a shoe. Here’s my dog, Tige, he lives in there, too. So how about washing your feet once in a while?”
The first one I thought of was Nacho Man, a song in a 1990s commercial for Old El Paso salsa sung to “Macho Man” by The Village People.
And then there’s the Enjoli perfume commercial from the late 1970s which features a take on Peggy Lee’s I’m A Woman song.
*”We’ve only just begun”*
Started life as a wedding themed ad jingle for a bank
One I’m fond of - dunno how widespread the company is – is Mattress Firm. But back to jingles and slogans, already iin progress.
I remember a feminist protest sign from back then:
I Haven’t Come a Long Way
. . . . . and I’m Not a Baby!
Gatorade’s Be Like Mike.