I used to browse /gif on 4 chan when I needed some brainless laughs until someone posted a "hilarious" giff of some fuck killing a dog with a shovel. I haven't been back since.
In more mainstream media. Super Meat Boy, which is certainly my game of the year, has one cutscene in which a small blob follows the main character around making kissing noises. Meat Boy kicks it causing horrific damage to it's face, which was pretty harsh, then it starts making the kissing noises again and he goes over and smothers it with a pillow.
I found it very unpleasant.