Memo to Axl, Slash et al - you'd better brush up on your geography before you head for Slane this summer, because this sort of behaviour doesn't fly with Irish crowds.

Guns 'n' Roses committed the ultimate rock cliché error the other day in Australia, where they're currently on tour with their 'Not in This Lifetime' comeback show.

Their announcer McBob shouted 'Sydney!' to the unimpressed Melbourne crowd, who responded by booing. Quite loudly, in fact.

The band apologised with a note on Facebook after the show, saying: "“Melbourne! Accidentally after 30 years McBob made an error, we’re truly sorry. Thank you for coming out tonight!”

Watch the offending moment below:

Band members Duff McKagan and Slash were also quick to apologise and defend their announcer for the 'Spinal Tap intro':