I had the same story, except with a stump, 1971.
My two B.I.L.'s wanted to blow stumps, they used 3 sticks of 60% on the first one, and used my '64 Impala for the battery.
They soon learned, one stick was too much!! :Stop:
The stump came down over 100 yards away!!
Ah, well, I am alive to tell about it!! :bananapow
No damage done, just a lot of fear!! :fing20: