I used to do that a lot..
My best was when I saw a cat in a field mousing.. I let-er-rip..
That cat went about a yard straight up
, twisted a 180 in the air, and hit the ground running..
... 2nd funniest thing I saw a cat do...
Eventually one night I blew a head gasket, side out of #1 or #4.. under hard throttle flame came out the side..
, but at low throttle it was OK, so I limped it home.. .. sometime after that I played with the kill switch, a lot less..
Cant say it did, or did not hurt the head gasket..
Ever crack the points while tuning, and have it backfire.. I did in a carport..
.. it sure got my attention..