I cane gone from s hool aged 11 sin ging 'Lady of Spain I adore you, take off your clothes I'll explore you' - my parents were scandalised!
I learnt the worm song in the Guides too.
I also use to sing 'oh Sir Jasper do n5it touch me' to the tune of Glory glory hallelujah' where each subsequent verse the last word was left off until you got to Oh Sir Jasper Do, then Oh Sir Jasper! OH SIR! OOOH! I thouht it hilarious.
Then there was the Foggy foggy dew.
My brothers used to recite:
Hark hark I hear thunder
Must be the peas I ate last Sunday
Quick quick, open the lav door
Too late too late, done it on the floor.
Also: A little birdie flying high
Dropped a message from the sky
Ugh said the farmer , wipung his eye
I'm jolly glad that cows don't fly!
All these are faily innocent schoolboy/girl humour!