Fallacy

I have this two friends who are both really nice people and they're really close - they've been best friends since kindergarten. And the reason why they became besties was cause of a very simple incident.

*A breaks B's pencil (or something)*
*B cries*
A: Ahhh sorryyyy! Don't cry, don't cry! I be your best friend k!!!

 I  really like this, it's heartwarming. They've stayed best friends ever since.
Friendship. <3