From behind the wheel of his car, Jack Black performed a brilliant a capella version of Nirvana’s Polly. I have no idea what he was singing, and I really don’t mind that I don’t know. Youtuber Bill Vapes took a stab at translating.
pehwn, shiga-flunu, tzuka flyny, m’bidu didu, daw.
flyny, ‘n, shuga flyny m’didu didu, daw.
Polly says her back hurts, shiga-flaow.
She just as bored as me, shiga-flaow.
She caught me on my guard, shiga-flaow.
Amazes me, the will, of instinct.
In me-e, uhh, I can never see-e, hmm.
Le m’éclair, ahm – I can nelly-weyhe-eehm.
I can – Let me take a raa-aa-aa, n’getchasayin’ aw. (gasp)
Once a meh-eh-awn’, I complete myseeh’-awwn.?