Medieval messy game?

Hi, I have had this great idea for getting messy after seeing an advert for a medieval day at a castle.
My idea is to have a jousting competition, but instead of using a lance, the idea is to throw a cream cake or similar at your opponent as they ride towards you, while trying to avoid the one they throw at you. When you reach the end of the arena, you turn round, reload with another cake, and ride back towards each other.
Not sure how you would determine the winner, could be number of hits, or managing to stay on your horse longest, etc.
It is just an idea, but one day I would like to have a go at it.
Now all I would need is another person to be my opponent (probably no problem there)
Somewhere to stage it
A pair of horses which don't mind getting messy
Someone to teach me to ride the horse
Someone to video the event.
A large supply of 'ammo'
Some training as I am not a very good shot
A large tank of warm soapy water to clean up with afterwards (not forgetting the horses will need a wash)
So all in all, looking at the above list, it will never happen, although I can dream.
What other ideas do people have for getting messy that they would like to do but are just impossible?
My idea is to have a jousting competition, but instead of using a lance, the idea is to throw a cream cake or similar at your opponent as they ride towards you, while trying to avoid the one they throw at you. When you reach the end of the arena, you turn round, reload with another cake, and ride back towards each other.
Not sure how you would determine the winner, could be number of hits, or managing to stay on your horse longest, etc.
It is just an idea, but one day I would like to have a go at it.
Now all I would need is another person to be my opponent (probably no problem there)
Somewhere to stage it
A pair of horses which don't mind getting messy
Someone to teach me to ride the horse
Someone to video the event.
A large supply of 'ammo'
Some training as I am not a very good shot
A large tank of warm soapy water to clean up with afterwards (not forgetting the horses will need a wash)
So all in all, looking at the above list, it will never happen, although I can dream.
What other ideas do people have for getting messy that they would like to do but are just impossible?