...1/4 stick of dynamite to a rock, lighting it a chucking it into the lake
M-80s used to work just fine also
I remember when we had M80s back in the 60s.
They were devastating to a mailbox.
Drive-by federal crime, teen style.
They sure did, but we had easy access to cases of 1/4 sticks. I liked the effect of a 1/4 stick more.