Smashing Pumpkins at the MEN ~2008. Think they walked off the stage in a huff that night too.
Vetiver at Mojo, Liverpool 2010. They were sound but I was goosed.
Phosphorescent at Primavera the other year. Shite.
Spiritualized at Primavera too, possibly the same year.
Suede at Primavera.
However many bands (Black Keys? Jack White?) on the Pyramid stage the other year. Woke up as someone was drawing a spunking cock on my face, shortly before Kasabian were on.