The only two bands that I remember walking out on were The Dream Syndicate and the Red Hot Chilli Peppers (both were opening acts that were too loud and talentless). I have a vague memory of walking out on another opening act (Hydra) from my teenage years, but that's going back to far in the memory bank.
The three worst "going through the motions" shows were: Van Morrison, Morrissey and New Order. All three only lasted around 45 minutes; so, they also felt like a double ripoff.
The three worst "going through the motions" shows were: Van Morrison, Morrissey and New Order. All three only lasted around 45 minutes; so, they also felt like a double ripoff.