You and Walker grew up together and were pretty good friends (you were best firnds). One day you pointed out that you were taller than him. So he made a bet with you. If you grew up to be taller than him then he owed you a favor and if he grew up to be taller then you would marry him (he was young). You both forgot this bet and he ended up becoming an actor like he always wanted. You were now 19 and watching videos of you and Walker with your friends when you saw you two make the bet.