I have found quite a few arrowheads at one particular location in SE Pa, enough that it has got me interested in learning about the Lenapes. (By the way that's pronounced Len AH pA , not Len ah PEE).
Anyway, I memorized how to say a few words & sentences in their language, and the next time I was fishing at this particular site I said out-loud in Lenape "This is a good day, do you speak Lenape". Immediately, a large tree came crashing down and fell behind me.
At the end of that same day I was walking out of the woods when I was literally kicked in the ***. There was a large forked stick on the ground, and when I stepped on it, it pivoted up and I got whacked in the butt by the other side of the stick's fork. Scared to hell out of me. This is an absolutely true story.
I've never spoken another word, think it better to just leave things be. When I was later in Arizona and speaking to a Hopi old man, I told him the story and he laughed hard. I mentioned that I might return the arrowheads to where I found them, he asked "Did you dig them up, or did you just see them on the ground?".
When I answered that I had just seen them and picked them up, he replied, "Well you did not find them .... they chose you. Keep them!" I have.