I got 2. Went to ZZ Top on New Years night (Dallas) in 80 or 81. No mention of a warm up band or anything on the radio. Lights go down, people pumped. Curtains open. Bunch of black guys called "the bus boys". Their lead off song was "I want to join the ku klux klan and play in a rockin roll band". They got booed off of the stage and we got an extra long zz set.
Another time we went to "Texas jam" a all day thing with about 7 or 8 bands. Sammy Hagar (pre halen) was next to last and just killed it. The headliners came out (Styx) singing mr roboto. Everyone got up and left. Place was half empty before their set was over.