Here's one about school dinners, sung at Tirphil Primary School, S. Wales. many years back:
If you have school dinners
You sit at the side.
Many have sat there,
Many have died.
Look at the gravy
So lumpy and still.
If that doesn't get you
The custard will.
(ed: to the tune of "Frere Jacques":)
School dinners, school dinners,
Mushy peas, mushy peas,
Soggy semolina, soggy semolina
I feel sick, get a bucket quick,
Oh too late, I've done it on my plate.