the original "Prefab Four" with a guest appearance by Davy Jones of The Monkees to perform his signature song, "Daydream Believer".) But U2's irony-drenched "big shtick" failed to satisfy many critics and fans seemingly confused by the band's new image and elaborate sets. One NME critic later recalled a "ludicrous hullabaloo" that was a departure from "Planet Reality." Disrupting a few shows, technical problems also arose throughout the tour. As the band were about to walk out of the giant mechanical lemon for the encore of a show in Oslo, the lemon malfunctioned, trapping the band inside and forcing them to escape through a small hatch at the back. This incident was later listed as one of "Rock 'n' Roll's 15 Most Embarrassing Stage Antics" by AOL's Spinner.com. The lemon malfunctioned again at a show in Sydney, and was not used at all, and also malfunctioned in Osaka, Japan, where the band were again trapped inside but unable to escape through the back. In addition to the issues with the mechanical lemon, the large LED video screen became damaged in Washington, D.C. by a rain storm during a concert. The video screen required time for repairs which ended up causing an entire concert in Raleigh, North Carolina to be cancelled. Like the band's previous Zoo TV Tour, PopMart was another huge success in terms of revenue, grossing US$173,610,864 from 3,982,657 tickets sold. On 20 September 1997, the band performed in front of over 150,000 people in Reggio Emilia, Italy, and set a new world record for having the most attendees at a concert for a single performer. More than a decade after PopMart, despite the criticism and mishaps, Bono said that he considered the tour to be their best. "Pop(Mart) is our finest hour. It's better than Zoo TV aesthetically, and as an art project it is a clearer thought." He later added "When that show worked, it was mindblowing." The Edge said that he was "very proud of [Pop] by the end of the tour. We finally figured it out by the time we made the DVD. It was an amazing show that I'm really proud of." Post-tour Appearance on The Simpsons In April 1998, one month after the PopMart Tour had ended, U2 appeared as guest stars on the 200th episode of The Simpsons, "Trash of the Titans." The episode featured U2 performing a PopMart concert in Springfield