Foreigner got one over on Styx during their recent "Soundtrack of Summer" tour, as members of the band dressed in costume and walked out onto stage while Styx was performing.

Styx keyboardist Lawrence Gowan offers an explanation and vows revenge in a recent Facebook post titled "Ladies Gone Wild":

"Things got a little out of hand at the Iowa State Fair during our last show of the Styx/Foreigner tour.

Keeping a straight face was not an easy task, but I think we did reasonably well under these shockingly sexy circumstances.

Much thanks to 'Ladies' Kelly Hansen and Jeff Pilson of Foreigner. Take heed lads: We'll get you for this!"

An accompanying video shows when Hansen and Pilson, dressed as women, walked out during Styx's set and climbed onto Gowan's keyboard while he was playing.