This is inspired by Moana, which has a song where the word “demigod” is rhymed with “decapod.” Never would I have ever come up with that word pair, much less expected to hear them in a song in a children’s movie.
So, how about examples of improbable lyrics or rhymes?
"Her breakfast coffee tastes like Cham…
Poo." - Tom Lehrer
I caught a good one, it looked like it could run
Up on its back and away I did ride
—El Paso, Marty Robbins
I spent my last $10 on birth control and beer;
My life was so much simpler when I was sober and queer.
But the love of a strong, hairy man has turned my head I fear–
And made me spend my last 10 bucks on birth control and beer.
Well it was June
of 1983
When Mary Lou and I did part.
“Who needs a hobby like tennis or philately?
I’ve got a hobby! Re-reading Lady Chatterley!”
I adore Tom Lehrer.
It’s alright to say things can always get better
You haven’t lost your brand new sweater
I know I had it on when I had my tea and I’m sure I had it on in the lavatory… Sultans of Ping FC
One flesh, one bone, one true religion
One voice, one hope, one real decision
Gimme one light, yeah!
Gimme one hope, hey!
Just gimme (Ah!)
One man (one man)
One bar (one night)
One day (hey-hey)
Just gimme, gimme, gimme, gimme…
…Fried chicken!
That’s what I wanted to post.
Every time I listen to that song, I just wait for that bit, and it delights me every time.
She had a woman’s touch, a young girls eyes
In seconds flat I was proselytized
Blood Sweat & Tears “I Can’t Quit Her”
This kind of thing would appear to be *Train’s *stock in trade with such gems as
“I’m so obsessed
My heart is bound to beat right out my untrimmed chest” (ugh)
“She was caught in a mudslide
Eaten by a lion
Got run over by a crappy purple Scion” (this one actually makes me smile)
“Can you imagine no love, pride, deep-fried chicken
Your best friend always sticking up for you even when I know you’re wrong” (nope)
“She checks out Mozart while she does tae-bo
Reminds me that there’s room to grow, hey, hey” (who the hell sings about tae-bo?)
For a more classic example, how about That’s Amore’s " When the stars make you drool just like a pasta fazool".
Old 97s - “Crash on the Barrelhead”
You’re gonna die the way you live
And the way you drink, you’re like a riv…
er bound for falls, not much fun
You’re gonna crash on the barrelhead son
A friend named their daughter “Elenore” and the first thing I said was “Did you know that’s the only song with the word ‘etcetera’ in it?”
Elenore, gee I think you’re swell
And you really do me well
You’re my pride and joy
Et cetera…
–The Turtles, aka Howard and Mark/Flo and Eddie
*You consider me the young apprentice
Caught between the Scylla and Charibdes. . .
. . .I will turn your face to alabaster
When you’ll find your servant is your master*
Wrapped Around Your Finger - The Police
The fact he’s over six feet ten
Might instill fear in other men
But not in me
The mighty flea
Ask if I am mouse or man
The mirror squeaked, away I ran
He’ll murder me in time for his tea
Does it bother me at all?
My rival is Neanderthal
Seven Days - Sting
“Lovers divided,
get coincided”
Anyone but Sondheim would have used “re-united” as the rhyme for divided.
There’s also:
An awful debility,
A lessened utility,
A loss of mobility
Is a strong possibility.
In all probability
I’ll lose my virility
And you your fertility
And desirability,
And this liability
Of total sterility
Will lead to hostility
And a sense of futility,
So let’s act with agility
While we still have facility,
For we’ll soon reach senility
And lose the ability.
Mephistopheles is not your name
I know what you’re up to just the same.
That is the song I came in to mention. Sting knew how to send me running to the encyclopedia back in the 80s.
Chefguy - what’s unexpected about Sting’s lyrics? The dude name-checked Nabokov in a pop single.
I would go with lyrics I didn’t quite realize I was singing along to. Like Foster the People’s Pumped Up Kicks when I find myself singing “Better run, better run, run from my gun.” Definitely a WTF?! moment.
Same with Smells Like Teen Spirit: A mulatto, an Albino, A mosquito, my libido, yeah!!
Yeah?
So, those were unexpected 
“The doctor came in, stinking of gin,
and proceeded to lie, on the table.”
Was kinda expecting Rocky Racoon to do that.
In terms of shock? value, sure wasn’t expecting to hear on 70’s fm radio:
“Show business kids, making movies of themselves.
You know they don’t give a fuck about anybody else.”
I got a kick out of Paradise by the Dashboard Light
Do you love me!?
Will you love me forever!?
Do you need me!?
Will you never leave me!?
Will you make me happy for the rest of my life!?
Will you take me away and will you make me your wife!?
I gotta know right now
Before we go any further
Do you love me!?
Will you love me forever!?
Let me sleep on it
Baby, baby let me sleep on it
Let me sleep on it
And I’ll give you an answer in the morning
I guess it’s cheating to bring up Weird Al, since unexpected lyrics are his specialty, but the first time I heard this I guffawed:
*I was watching my TV one night when they broke in with a special report
About some devastating earthquake in Peru
There were thirty thousand crushed to death, even more were buried alive
On the Richter scale it measured 8.2
And I said, “God, please answer me one question:
Why’d they have to interrupt ‘The Simpsons’ just for this?”*