On the last day of Metalfest Open Air in Zadar, Croatia, W.A.S.P. was to have a set, but was cancelled in the last moment because they didn't like the schedule (poor babies). Anyway, Megadeth replaced them, but the crowd just yelled "We want W.A.S.P.!" and started raging, even throwing stones at the band as a sign of protest! One of the stones hit Dave Mustaine in the head.
http://www.youtube.com/watch?v=ijgPxuiqcEk
What's ironic is that Megadeth played in Croatia a few times, and several hours before the concert, David Ellefson praised the country and its audience.
What.