Exact lyrics for the part in the movie dumb and dumber ?

Does anyone know the exact lyrics for the part in the movie dumb and dumber (the first one) when they're in the sheepdog singing mock, ing, bird, yeah, bird, yeah, yeah, yeah etc.. Haah. If you do please let me know!

Mock, yeah
Ing, yeah
Bird, yeah
Yeah, yeah
Mockingbird...

Everybody have you heard
He's going to buy me a mockingbird
And if that mockingbird don't sing
He's going to buy me a diamond ring
And if that diamond ring won't shine
He's going to surely break this heart of mine
And that's why I keep on tellin' everybody...

Hear me now and understand
He's going to find me some piece of mind
And if that piece of mind won't stay
I'm going to find myself a better way
And if that better way ain't so
I'll ride with the tide and go with the flow
And that's why I keep on shoutin' in your ear...

Everybody have you heard
She's going to buy me a mockingbird
And if that mockingbird don't sing
She's going to buy me a diamond ring
And if that diamond ring won't shine
going to surely break this heart of mine
And that's the reason why I keep on tellin' everybody...

Listen now and understand
She's going to find me some piece of mind
And if that piece of mind won't stay
I'm going to get myself a better way
I might rise above, I might go below
Ride with the tide and go with the flow
And that's the reason why I keep on shouting in your ear...

Also makes an appearance in National Lampoon's Vacation.

Mock yeah ing yeah bird yeah .. yeah yeah mocking bird dont everybody have you heard .. shes going to buy me a mocking bird and if that mocking bird dont sing shes gonna buy me a diomand ring and if that diomand ring dont shine !!