kickback takes his arm off. is that paranoid? EDIT: I agree with Zeke. Chainsaws aren't like lawnmowers. You don't just walk up, pull the cord and start cutting.
When friends ask for a serious tool, I tell them "I won't loan you the tool, but I will loan you the tool with operator attached (me)."
Here's a tree my dad and I diced up a few weeks ago. The oak was rotten in the middle and came down during a storm.