In 1983, I bought a 'spare' ticket to one of U2's last university campus gigs at Exeter. The ticket turned out to be stolen and I didn't get in. Not U2's fault, but I had a bit of a downer on them for a while after that!
Thirty-two years later and they're still going! Laura got great tickets to their Innocence + Experience Tour for me as an anniversary present. U2 rock!