Alright, this has to be the most bizarre story I have read in a long long time...
Costa Rican website Al Dia is reporting that Jamiroquai sound engineer Rick Pope had a small 'fight' with the sound engineer of Argentinan artist Diego Torres, who was also performing at the Festival Imperial in Costa Rica on Saturday (1 April).
According to the report, an argument took place because the start of Jamiroquai's sound-check in the morning was delayed because the sound-check of Diego Torres took too long.
The original story is available at the Al Dia website (in Spanish) and in (semi) English via the Babelfish translation site.
According to the story, peace has since been made between all involved!