For some odd reason, I'm kinda offended by this...
"Fat" people are already subconcious enough about themselves and should not be ridiculed. Yeah, yeah, I know if they really do feel bad about their appearance, they should do something about it..... Either way, laughing at someone's appearance makes me feel bad; unless it's Karky then it's OK.
Disclaimer: must have been implanted in my head when I dropped my pants and the girl just laughed and laughed... (fictious story here)