I'll be watching a video, and suddenly, I hear, "STAIN GONE, THE STAIN IS GONE!" or something from a tide ad, or annoying as hell music from some Pantene commercial while I am trying to focus on the video. It is really annoying because it happens like, every 3 minutes. Even if you pause it, soon enough the ad will reset itself, and sometimes I accidentally click on the ad when trying to mute it or pause it.
Solution: Use Mozilla firefox's adblock.
But, damnit, youtube, why do you have to stoop so low as to using these scam advertisements, and the sound advertisements.