Thanks for the tip - maybe this is the one - I wonder where my Dad would have heard this?

Verse 1
I went upstairs in the middle of the night,
I tiptoed in and I turned on the light,
And to my surprise, there was no one in sight,
My Uncle Walter goes waltzing at night!

Chorus
He goes wa-wa-wa-wa, wa-waltzing with bears,
Raggy bears, shaggy bears, baggy bears too.
There's nothing on earth Uncle Walter won't do,
So he can go waltzing, wa-wa-wa-waltzing,
So he can go waltzing, waltzing with bears!

Verse 2
I gave Uncle Walter a new coat to wear,
When he came home, he was covered with hair,
And lately I've noticed several new tears,
I'm sure Uncle Walter goes waltzing with bears!

[Repeat Chorus]

Verse 3
We told Uncle Walter that he should be good,
And do all the things that we said he should,
But I know that he'd rather be out in the wood,
I'm afraid we might lose Uncle Walter for good!

[Repeat Chorus]

Verse 4
We begged and we pleaded, "Oh please won't you stay!"
We managed to keep him at home for a day,
But the bears all barged in, and they took him away!
Now he's waltzing with pandas, and he can't understand us,
And the bears all demand at least one dance a day!

[Repeat Chorus]