Phineas and Ferb Gene are prep-school cronies in the last years of WW II. Phineas is fearless, socially and physically; Gene is an academic and apprehensive. In a way, they compliment each other, yet there is an undercurrent of jealousy. The plot develops around a feat of daring-do: a leap into the river from a tree limb. Phineas is injured during one of these daredevil stunts: probably the fault of Gene. This event eventually causes them to share their qualities, but later leads to Phineas' early death, and causes Gene to become a "whole" person. You should also read J. D. Salinger's, "Catcher in the Rye."