the waterboys absolutely killed u2 back in the day, this was in a 2000 seat auditorium just after "unforgetable fire" was released. u2 only played for just under 90 mins. and they played like they just did not care. And the waterboys were so good i bought "this is the sea" the very next day.
'they blew'em off the stage'
what concerts have you attended, where the warm up act blew the headliners away.....my examples...brownville station upstaging zz top to the point where people where chanting 'brownsville station!' during the littl ol' band from texas' set.....another..t.rex upstaging lynyrd skynyrd(yes there really was such a show), and the grass roots upstaging cream.