Kids playing baseball get into a heated argument. Cutter (apparently drunk) arrives and challenges one of the boys to what seems to be a vocal fry contest. After a brief demurral, the boy obliges. After about 32 seconds of "errrrr" noises from both, the boy cannot do it anymore and concedes defeat, but Cutter continues in a trance-like state for another 40 seconds until the PSA ends, with an excessively long final note, lasting about 20 seconds, on the chorus of "G. I. Joooooooooooooe..."
This is FenslerfilmPreserve, a YouTube channel dedicated to preserving the classic Fenlerfilm GI Joe PSA parodies. Every single parody has been uploaded here, remastered by Bronx Rican (using the original audio from the PSA and DVD-quality video from the original PSAs).