Clash of the titans? I saw it in S.C. and they headlined. Megadeth ended with Anarchy in the UK and people started throwing hard plastic cups and kept hitting Tom while he was headbanging. He was pissed. He was like "do you think we will ever play here again?" And before war ensemble he said "do you want a war? If you keep this shit up your gonna get one" then finally at the end of the show he was basically like "I guess we won't need to buy anymore cups in the future".
Dave Ellefson thought it was funny until someone pegged him in the head with one. Fucking assholes don't know how to enjoy a show so they throw shit at the band they paid to see? Fucking morons