Consider that the male members of ABBA also sang that line. Think about it for a moment.

This isn't the sort of song ABBA would flower on, even if it's on the same album as 'Waterloo'. A dolly attempt to sound hard and funky, the whole song is juvenile. But the real fun is that they got sidetracked just at this point. Bjorn Ulvaeus has told the story of a show in Stockholm Concert Hall in '74: "In the middle of 'King Kong Song' there's a kind of percussion break, and then the girls shout Aaaarggh! and the chorus returns. Now, at that point one of the girls got in screaming two beats too early, and half the musicians followed her, and us others went on as it was supposed to be. From then on we couldn't hook up again. The song just ran away and petered out..."