[1] The title is a reference to A Portrait of the Artist as a Young Man by Irish novelist James Joyce.
On the last day of school, children emerge from a one-room schoolhouse, gushing with joy about summer vacation.
In the end, Elmer obtains a machine gun (which actually fires corks) and shoots Bugs repeatedly after he crashes into a tree.
The dream ends, and the adult Bugs - conscious and apparently never having felt the effects of his own injury - remarks about how he and Elmer probably were "the youngest people to ever start chasing each other."
Of course, Bugs could be wrong - a young Wile E. Coyote runs by, chasing an unhatched Road Runner.