But judging by the reaction of the tens of thousands of fans bouncing along last night, they got it badly wrong.
The band, formed in Los Angeles in 1983, proved they still have what it takes as founding members Anthony Kiedis and Flea turned up the heat at the Boucher Road playing fields in south Belfast.
As psychedelic lighting swirled, the smiling crowd sang along to old favourites and more recent offerings, including Snow (Hey Oh), Look Around, Californication, Other Side, Suck My Kiss, Give It Away, By The Way, Under the Bridge and The Getaway.
The band do not plan to be away from Ireland for too long, as yesterday it was announced that they will be in Dublin on December 20 to play the 3Arena.
Tickets for the concert go on sale next Wednesday.
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