I believe the teenage reply these days would go.... "OMG"
Don't try this at home kids!
I made a cannon once when I was in my early 20's.....Worked well for quite a few shots..... But then I still bear the scars on my fingers where the shrapnel from it's last shot slashed across one and embedded itself into the bone of the other....Got the feeling back in the latter after about 5 years!
Quite shocking really.... I had my fingers in my ears!

Needless to say I never made another one.
Can be quite dangerous this gunpowder stuff!
Mmmmm.... Just wondering how he got all the glass out of the keyboard??
Ralph.