In April 1988, at a concert in Antrim, Northern Ireland, Mustaine unknowingly dedicated the final song to the IRA. Mustaine later alleged that he had been misled as to the meaning of the expression "the cause" by T-Shirt bootleggers outside the venue where they were performing. Before the final song, "Anarchy in the UK", Mustaine said, "This one's for The Cause!". A fight amongst the audience ensued and, according to Mustaine, the band had to travel in a "bulletproof bus" for the remainder of the tour of Northern Ireland and the Republic of Ireland. This incident served as inspiration for one of Megadeth's most well-known songs, "Holy Wars... The Punishment Due".