The intent is to get people to buy Macs. The cunningness of the ad is to get people who see themselsevs as cool or who want to be seen as cool to not associate with these uncool machines. The Lemmings ad and most of Samsung's ads attack the potential customer, not the product. That makes all the difference, just like on this forum where one can say, "Your comment is ," but can't say, "You are ." It's a clear distinction.
There may be a clear distinction between calling the machine uncool, and not the person, but the message is also clear and the same - Use a Mac and don't be uncool. Samsung's ad is use a Samsung device and don't be a wall hugger. The iPhone users themselves aren't innately wall huggers, but it's the device that makes you one.
Being uncool is a result of owning a Windows just as being a wall hugger is a result of owning an iPhone. The concept and the message is the same.
Problem is, the Samsung ads come across as snarky and irritating, whereas the PC/Mac ads came across as good-humoured and endearing.