Dear me, this brings back memories. Our three kings were in Trafalgar Square, not Leicester Square, and it scans better. One not mentioned so far:
Good King Wenceslas looked out
Of his bedroom window
Silly bugger, he fell out
On a red hot cinder
Edit 2 - I’ve remembered how this continued:
Brightly shone his nose that night
Though the pain was cruel
Then the doctor came in sight
Riding on a mu-u-le
…and of course this relies on the northern pronunciation of ‘window’, and ‘bugger’ not really being considered a swear word where we came from, so you could sing it in front of your grandma without consequences.
There is also a version of Jingle Bells
We used to sing:
Jingle Bells, Batman smells,
Robin ran away
The Batmobile has lost its wheel
And landed in the hay
There is a superb video by Tom Scott about this
Further memories are coming back:
Oh come all ye faithful
United/City are disgraceful
depending on whom you supported, but I can’t remember the song continuing, and also in ‘Ding Dong merrily on high’, we always replaced the last line
Hosanna in excelsis with ‘United versus Chelsea’.
Edit:
And
@duncanp , my version of your carol in #3 has just come back too:
We three kings in Trafalgar Square
Selling knickers, tuppence a pair
They’re fantastic
Without elastic
Very unsafe to wear