[bombcar]

It's not common and they're expensive, but it's possible and apparently fun: https://www.youtube.com/watch?v=ZXtswMYlBd0

(It's probably $5k to $10k to get a working cannon, and most owners are probably reenactors and movie-proppers.)

[rsynnott]

I'm now curious if one could license one here. It doesn't _obviously_ fall into any of the categories that would make it prohibited (as opposed to merely restricted), and it's not like it'd be very useful for criminal purposes, but it might be hard to sell the gardai on the idea that it was essential for farming. (Surely at some point there's been a sport that involves cannon, tho...)