AC/DC believe their world tour sold out so quickly because fans think they might die on stage.
The rock group are due to begin a series of concerts later this month to promote their new album 'Black Ice' and were amazed when tickets to their shows sold out in a matter of hours.
Frontman Brian Johnson, 61, claims some people only paid to see them in case one of them passes away mid-song. He said "Some fans are saying, 'The singer's 61. I'm going to that show, I might see him die.' "
Brian has even decided to employ an exercise expert to ensure he is in shape for the forthcoming concerts.
He added: "I've got a fitness guy coming in from Formula 1 who is going to work with me for two weeks. He's a specialist in stamina. He is going to work us like a dog."
The band are due to play 42 dates in North America, and will kick off their UK tour next April.