As they approached, Jesus said,
John 1:47-49 NLT
So to get the "BAM," i took the words from Mark Moore in his book The Chronological Life of Christ: Volume 1 From Glory to Galilee.
"Nathanael is deeply impressed that Jesus knew him. Then Jesus says. in so many words, "Oh that was nothin', watch this: I saw you sitting under the fig tree!" This so impressed Nathanael that he confesses that Jesus is the Messiah of the God."
Through the unexplainable G-d reveals himself to us. He shows us what His kingdom looks like. We see the story unravel that includes us as characters interacting with the one in the lead role. Jesus is King!