Guns N' Roses' 'Not In The Lifetime Tour' continues in Adelaide on Saturday, before finishing in Perth next Tuesday, 21st February.
It was the least Gunners could do for the Melbourne crowd after all, mistakenly shouting out 'Hey Sydney!' to them earlier in the night, only to be met with boos.
Gun N' Roses had already arrived late on stage, so what happened next was NOT the way to win the crowd over.
Guitar technician McBob has been introducing the group on to stages around the world during their latest shows.
The crowd, predictably, began to boo.
Sydney and Melbourne, Australia's two largest cities, have had a long-running rivalry dating back to gripes over trade during colonial times. Lead singer Axl Rose presumably took his cue from that original mistake.
After the show, Guns N' Roses attempted to smooth things over with some snappy tweets to local fans.
The band issued an apology on Twitter, saying "accidentally after 30 years McBob made an error, we're truly sorry. Thank you for coming out tonight!" read a message from the official Guns 'N Roses handle.
The mix-up, which you can see in the fan-shot footage above, was greeted with boos but was ultimately just one small bump in a well-received performance.