"We've been known to play a prank or two," Good Charlotte frontman Joel Madden once confessed. "Back in the day, when we were still touring in vans [with New Found Glory], they'd come out after playing a show and their van would be completely covered in flour and peanut butter, which is impossible to clean..."

New Found Glory's revenge? "They dumped rotten food all over us -- while we were onstage."

[On another occasion, New Found Glory hid Good Charlotte's equipment and let them think it had all been stolen.]