A relationship is a collection of memories you share with another person, some of those moments may be monumental and full of so much meaning. U.S. Marine Capt. Alex Grubbs and his girl Brina Saldivar shared their first date two years ago on October 31 at the Science Museum Oklahoma. Ironically enough, Brina is at the museum on the same day, different year but has no idea Alex is waiting to surprise her. After participating in a brief science experiment on-stage, Brina is met with her Marine, down on one knee.

This next video demonstrates the power of symbolism in a relationship and to never underestimate the element of surprise. This couple is standing on a bridge, adorned with padlocks. Sure enough, they are about to add a lock of their own and exchange keys. Little does she know, he has another "key" to her heart.