Couldn't get this song out of my head so I parodied it. Set to the tune of Tom Lehrer's "National Brotherhood Week"

Ninja Amnesty Week
By Kaori

Oh the Rock-nins, hate the Leaf-nins
And the Leaf-nins, hate the Sound-nins.
To hate all but the right nins
Is an established ninja rule.

But during, Ninja Amnesty Week, Ninja Amnesty Week,
Raikage and Hokage are getting drunk while dancing in the street.
It's fun to spread good will
With the guys you'd normally kill.
It's so unnatural we could cry.

Oh Naruto, hates Kabuto
And Kabuto, hates Kakashi
Orochimaru hated Arashi
But settled for Sandaime's hide.

But during, Ninja Amnesty Week, Ninja Amnesty Week,
Akatsuki sends cards to jinchuurikis 'cause it's very chic.
No kunai's in the back
So we can all relax.
You could get along if you try.

Oh the Branch House, hates the Main House.
And the Main House, snubs the Branch House.
We try not to think about, what goes on at Sasuke's house.
It's a rather scary scene.

But during, Ninja Amnesty Week, Ninja Amnesty Week,
Hanabi-hugs-all-the-Branch-House-members-way-too-tightly Week.
Try to be kind to
People who'd usually murder you.
It's one whole week that we are in the clear.
There's no way we could make it last all year!