Hard to believe, but I saw a Canadian band called the Trews open for Robert Plant, and i enjoyed the Trews more. Plant rearranged 5 or 6 of his and Zeps songs, and i wasn`t impressed. He made 2 Zep songs into reggae songs.
Dio opening for Aerosmith...Dio had just released his first solo record and Aerosmith were at the lowest depths of their drug addicted dysfunctionality. The crowd actually turned on Aerosmith and they had to cut their set short.
Bad Brains opening for RHCP....it wasn't even close.