So I've noticed this vine-like plant that's been growing around the yard somewhat like a weed (it probably is). On it, I see what resembles snowpeas growing but only smaller. They are usually about an inch long and sometimes an inch and a half. After that, they turn really dark purple and dry up and when you "crush" them between your fingers, they snap open and twist apart all while throwing their peas/seeds a couple inches around. I'm curious as to whether or not they are safe to eat? And what are they? Thanks!