I remember something like that happened when I started playing Seasons, a jogger froze to death and everyone walked over to mourn him and then they ended up freezing to death... I'm not sure how I feel about sims dying because they are wearing the wrong clothes, it's funny but I can't help but also think that it's pretty dumb considering that they can change clothes at any moment. I use a nice mod from bienchen which tells the sim to change their clothes if they are too cold or hot.
And yeah, I like GrayStillPlays. His videos are pretty great. I wish he could share his sims on the gallery.