One job I had, I was working with a temp
and I was showing him the ropes.
I was providing instructions and scripting
for tech support emails
to him.

"While you’re getting used to it," I said,
"Hold off on sending mail out without me reviewing them first."

A couple hours later I was looking over some responses
to emails that had gone out.
Turns out he had skipped my review process
and one correspondence (at least) miscommunicated some info.
"Maybe he misunderstood," I thought,
but then I thought about what I relayed to him
and there was really no way for my instructions to have been lost.

I had to bring it up with our boss
who made the decision that he wasn’t living up to expectations
and didn’t need to come back
so the temp agency sent someone new.

I did that.
I held the power of life and death for this temp in that office.

Years later, I myself was fired from there
so the circle of life went round and round.
Good for me.