Highcokalorum?
There were two teams of about eight or more.
The head of one team stood with his back to the wall with No. 1 ducked down facing him with his head between his legs. No2 was behind No.1 with his head between No1.'s legs and so on. You then had a line of blokes looking like a caterpillar.
The other team would take it in turn to vault over the rearmost member of the caterpillar and land with maximum effect on one of the other team. He would remain there and then another one would then vault and join him. Bouncing and bumping to was permitted and the object was to load one of the crouching team until he collapsed.
The would normally happen once you had got four or five on one person. Sometimes to their severe injury.
It was banned in the early sixties.