Oh Yes! These were the bane of my childhood. We went barefoot if at all possible, and I must have had hundreds of these over the years.
The seeds are shaped like caltrops, and are distributed by animals who step on the seed; the seed are scattered by being released somewhere else. The plant (also known as a puncture vine) are in the botanical family Zygophyllaceae which is commonly called the Caltrop family as the feeds are shaped like the old defensive caltrops that were used to disable horses and people, much like mines are used today.