That comment about a cannon put me in mind of Ernie's homemade mortar from a few years ago.
https://talk.newagtalk.com/forums/thread-view.asp?tid=102814&posts=40&highlight=mortar&highlightmode=1#M727901
https://talk.newagtalk.com/forums/thread-view.asp?tid=197408&posts=11&highlight=mortar&highlightmode=1#M1452337