One that stood out for me was when I went to the FA cup game there in 2006, the one when Micah scored at the end. The attendence was 23k and City took over 6k, so 17k home fans for a supposedly big club is quite a poor turnout. They seem like quite a fickle fan base.
Having said that I've been to some good away games at Villa Park and always enjoyed it as an away. Never personally had any mither there or with their fans. The 5-1 when David White scored four was probably my favourite. I always found Birmingham City a worse place to go.