This is an oldie but goodie!
“You can’t see the indicator move!!”
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This is from so long ago I can’t remember the brand. But there was a tire commercial that said (and I swear this is true) “It’s metric so it holds more air.”
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I hate to say it, but that one’s true. When converting from old-style tires to today’s metric sizes, you usually need to go up to the next size. Slightly larger tires hold slightly more air, and some designs such as “LT” metric tires need more air pressure as well.
But it is a dorky advertising claim. They might as well have said “We use black rubber, so you know they’re tires!”
Well, if it’s a legitimate claim, that’s perfectly meaningful (and I yearn for the days when “scientific” would be something that would draw people to a product). I really wonder, though, what in the world that “breath measuring machine” would be.
Do they have a rooftop dining area?
Does non-sensical count?
Picture this:
Barney and Fred are eating their Fruity Pebbles (crap sugary breakfast cereal for you foreigners. 
)
And Barney says “How about twelve?”
Then he eats twelve little pieces of Fruity Pebbles, and his head becomes a purple elephant head.
Barney says “Nope, not twelve.”
I’m guessing it’s supposed to be like the “One os never enough” theme. But, WTF?
Oral B - The toothbrush used by more dentists than any other brand.
Implication: Knowledgeable professionals choose this brand based on its superior qualities.
Reality: We budget more for distributing free product to dental clinics than any other brand.
Yeah, I’ll have the brand where I don’t have to subsidize the giveaways to dental clinics, thanks.
“Ask any mermaid you happen to see!”
Here in SoCal we have a mattress chain that says “We’ll beat any advertised price or your mattress is FREEEEEEEE!”
it’s kind of a reversal of Apple’s position in the market. back in the day, it was “Think Different.” Now it’s “don’t you want to be like everyone else?”
I think it’s partly because Diet Coke tastes so different from regular (and not primarily because of the sweetener, they’re rather different formulas entirely) that people expect diet versions of sodas to all be different then their liquid-candy versions.
Coors used to do stuff like that. “Taste the Cold.”
A few of us used to append “Because you can’t taste anything else” to that. 
Not exactly a tag line, but I remember an ad for Hidden Valley Ranch dressing that said something to the effect of: “We asked people what they want their Ranch dressing to taste like.”
One of the responses was “I want mine to taste good!”
Really? Because I want mine to taste like ass!
At the XXX Comany we care about you, at least since the FTC told us we had to