Imagine you imagining that you love me
And starting on a family tree
Imagine starting on a family tree
The mama is you and the papa is me

If your heart goes bumpety-bump
It's love, love, love!
If your throat comes up with a lump
It's love, love, love!
If your knees go knockety-knock
It's love, love, love!
If you're cuckoo like the cuckoo in the clock
It's love, love, love!

Imagine you imagining a cozy flat
Complete with running dog and cat
Imagine having running dog and cat
And we will have welcome all over the mat

If your heart goes bumpety-bump
It's love, love, love!
If your throat comes up with a lump
It's love, love, love!
If your knees go knockety-knock
It's love, love, love!
If you're cuckoo like the cuckoo in the clock
It's love, love, love!

Imagine you imagining a man and wife
We'll go and buy a fork and a knife
Imagine eating with a fork and a knife
How ritzy we'll be for the rest of our life

If your heart goes bumpety-bump
It's love, love, love!
If your throat comes up with a lump
It's love, love, love!
If your knees go knockety-knock
It's love, love, love!
If you're cuckoo like the cuckoo in the clock
It's love, love, love!
___________________________________________

What?
"If your knees go knockety-knock
If you're cuckoo like the cuckoo in the clock"?

It's gotta be the great Guy Lombardo and his orchestra back in 1944 playing "It's Love, Love, Love"

Regrettably, they don't write lyrics like that anymore... thankfully.