Well, versions of it..

I know we were singing this in the early 60's ..

We must have been weirdos in the Mid-west :-)

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"The Hearse Song" is a song about burial and human decomposition, of unknown origin. It was popular as a World War I song, and was popular in the 20th century as an American and British children's song, continuing to the present. It has many variant titles, lyrics, and melodies,[1] but generally features the line "the worms crawl in, the worms crawl out", and thus is also known as "The Worms Crawl In".[2]

History
While there are reports of the song dating back to British soldiers in the Crimean War (1853–1856),[3] it certainly dates to at least World War I (1914–1918), when it was sung by American and British soldiers,[4] and was collected in various World War I songbooks of the 1920s.[5] The key line "the worms crawl in, the worms crawl out" appears in some versions of the otherwise unrelated song "There was a lady all skin and bone", and may date to 1810 or earlier.

https://en.wikipedia.org/wiki/The_Hearse_Song

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And I didn't know about it until my late 50s. Drag, but better

: late than never. We usually sing 'Another One Bites the
: Dust' when a funeral happens a block away, but hey! And
: when there's a procession of any kind. . . "Wedding or
: funeral? What's the difference?!"

: We bad. (Or are we?) We have no respect for the status quo.
: We've taken up some very Catherian 'tudes. . .on steroids,
: along with pragmatism taken to extremes that may be
: considered antisocial. (Short of eating small children.)
: Because of this, we consider the human race nuttier than
: ever.