Pics and vids from here and there and video archive and self collected.
Thanks to all 
and as usual: feel free to use your shoulder clapping machine for 15 minutes.
Except Kade181727 - 60 minutes for the very special 30 seconds with Shelby 
here is
The Jimmy Castor Bunch - Bertha Butt Boogie 
(could be even longer (6:10), but with less quality)
The lyrics - might help a bit to understand the rythm if you can’t listen.
[Chorus]
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
[Verse 1 - 00:15]
The party was jumping - When Bertha got off of her stump …
The whistles were blowing - And everybody did the bump …
But all the time Bertha had been working on a goodie ..
Now folks call it - The Bertha Butt Boogie
[Pre-Chorus - 00:33]
When Bertha Butt did her goodie .. She started .. the Bertha Butt Boogieeeeeeee
No question
[Chorus - 00:46]
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
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[Verse 2 - 00:55]
When Bertha got moving her hips were humming in the wind
The ground started shaking - No grass grew where she’d been
The music was popping - The crowd had formed a ring …
Her sisters yelled “Boogie, Bertha, do your thing!” …
Oh, for your information .. Bertha had three sisters …
Betty Butt .. Bella Butt .. And Bathsheba Buuuuutt (01:22).
[Pre-Chorus - 01:25]
When Bertha Butt did her goodie .. She started .. the Bertha Butt Boogieeeeeeeee
I said no question
[Chorus - 01:37]
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
[Verse 3 - 01:48]
Hey Leroy - get away from that woman! … That boy will never learn ..
Uh oh .. here comes the troglodyte .. Come here .. sock it to me …
Bertha stood back and yelled “Betty, Bella, Bathsheba!” …
And the Butt sisters backed her up When she yelled, “I need you!”
The troglodyte, Leroy, Luther And the Butt sisters all knew …
That the Bertha Butt Boogie .. Was now the thing to do ..
[Pre-Chorus - 02:27]
When Bertha Butt did her goodie .. She started .. the Bertha Butt Boogieeeeeeeee
No question
[Chorus 02:40]
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
[Verse 4 - 02:50]
I’ll sock it to you, daddy …
Me like … me like … Come here .. Woman .. woman ..
Come on .. I’m calling you man … Yeah .. the boogie
[Chorus - 03:10]
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
(longer part music)
[Pre-Chorus - 03:43]
When Bertha Butt did her goodie .. She started .. the Bertha Butt Boogieeeeeeeeee
[Chorus - 03:55]
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
Bump, bump, bubbadump - Bah bump bump bump, bubbadump
(longer part music)