I liked the following question and answer:

Q: If the catapult where to fire again would there be enough room to load a cow?

A: Does your mother in law know that you have plans for her? If however you are referring to the bovine variety there are some points to consider with regard to ammunition. Firstly the ballista has a fairly narrow launch channel designed to accommodate a stone ball of about 350mm diameter which is launched by a sling behind the it. Clearly a cow would require a much larger ‘slipway’ and of course a sling of equal proportions. In addition, whilst festering cows were a favourite in times of siege to spread disease amongst the enemy I have a feeling that these days there might be certain conventions controlling the use of biological weapons. However adaptation of the ballista to accommodate dysfunctional relatives is a possibility.

Yeah, how much is in the treasury? Starting bid is 25,000 pounds. Don't try to out bid me.