Bono's daughter Eve Hewson once pulled a prank on singer Justin Timberlake after finding his number in her famous father's address book.
The actress was just 11 when she called the Suit & Tie hitmaker and started asking him questions from a quiz on the back of a cereal box.
She says, "We pranked a lot of people, but he was the one who answered. A few other people answered, but they hung up the phone.
"I think he didn't hang up because he was getting the answers right and he enjoyed that. He seems like a guy who likes to get it right."