My neighbors have a pyracantha. I have always disliked that tree. It is right by the property line, so half of the tree is always hanging into my yard dropping the orange (inedible and possibly poisonous) berries where my kids can reach them. Today I have reason to bless that tree. Because I thought its berries were poisonous, I've taught my kids not to eat them. We call them bird berries and I tell them they are for the birds.
A few months ago in my front yard I had a volunteer vine start to grow. It was very pretty, with purple flowers with yellow centers and bright red berries (bird berries I told my kids). I decided to prune it back and try and identify it. Well, I found it here. Yes, you guessed it, bittersweet nightshade. The berries don't taste bad, so kids might keep eating them and they can be deadly. (On a side note, I kept thinking to myself, I'd better identify that plant in case it turns out to be something like nightshade.) So I put on gloves and went and pulled it out.
Now I'm grateful for that pyracantha tree that forced me to teach my kids that not everything in our yard is edible. (Especially my son who still insists on putting everything in his mouth.)