When I was about fifteen years old I was at a house party with some of my mates and we were hanging about in the back garden, having some beers and a BBQ. A couple of gardens down we started getting some trouble from some other kids and eventually one of them threw a jar of mayonnaise over the fence and it hit out friend Matt in the head. It was a fairly nasty knock and it all kicked off after that.
Later on my Dad came to pick us up from the party and asked us how it was- I told him the story of Matt getting hit in the head with a jar of mayonnaise and, quick as a flash, he said...
... I hope you put a dressing on it...
Pundemonium!