If he hears, he’ll knock all day
I’ll be trapped and here I’ll have to stay

Who Can It Be Now? by Men at Work was released in Australia on June 6, 1981, with Anyone for Tennis? as the B side. The song was released prior to the recording of the band’s debut album, Business as Usual. It was later included on the album.

The song reached No. 2 on the Australian singles chart. In the United States, it went all the way to No. 1 when it was released there more than a year after its Australian release. It had mixed reception elsewhere, only reaching No. 45 in the United Kingdom and in New Zealand.

Watch the music video for the song.