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The original pull-tabs were a metal tab that was fastened to a portion of the top of the can, you would lift the tab to break the seal and release the pressure (if any) in the can, and then keep pulling the tab to remove it and the metal from the can. The edges of the removed metal were sharp and many people did step on them and hurt their feet. Some people would drop them back in the can and some would later get these back as they consumed the beverage from the can. Some people collected them and made stuff like belts from them.
Some areas starting banning their use in the 1970s. Today most of the beverage cans I see have a tab on them that acts as a lever to push part of the top inside the can to reveal an opening. Everything stays attached to the can so there is nothing to wander off by itself.
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