I have long since stopped paying any attention to commercials, initially I would channel surf but now I just turn the sound off and think about life for 4 minutes!
This is for 2 reasons - on a lot of channels they are substantially louder than the programmes, and secondly, so many of them are HIGHLY irritating. Adverts aimed at stupid / poor / paranoid people just make me want to chuck the TV out of the window. E.g.:
"Have you been injured in the last 3 years?"
"How do you know your kitchen is REALLY clean unless you use these totally un-environment friendly disposable wipes" (footage of baby crawling across kitchen floor)
"Have you got chodloads of debt? Hey, why not get ANOTHER loan to pay for all the ones you've got! That's right! You'll end up paying more interest but you're too stupid to realise that!".
"Is your diet awful? Why not drink a few minerals in a non-biodegradable plastic bottle, that'll make you loads better!" Jesus it's amazing the human race has survived so long isn't it.
I guess this comes from watching too many cable channels...