When my son Reed was 2 he picked up a bean that grows inside the pod of a plant here in SD. It was a Castor bean/plant. They have prickly pods and they drop to the ground and dry out and there are black beans in them, Those beans contain the chemical ricin and one is enough to kill an adult! We rushed him to Rady Children's. He had an irregular heartbeat for a moment and it was so scary!
This is what they look like: