That's not what a Nintendo controller's plug looks like!
This is the Nintendo controller promise ring designed by Paul Michael Design (of Wonder Woman, Pokeball and Triforce ring fame). Why a Nintendo controller for a promise ring? Because, "I Intendo marry you." Not a very good pun. Besides, that thing looks like it has jewels in it, why would you buy an expensive promise ring? I thought promise rings were supposed to be cheap. You know what makes a good promise ring? A twist-tie. You know what makes an even better promise ring? No promise ring at all. Fun fact: one time I let a girlfriend wear my class ring and she lost it. Just kidding, I never had a class ring. Or a girlfriend.
Thanks to lebeeps, who agrees the best promise ring is an actual wedding ring.