Saturday Night Live, Internet Celebrities
The first one can be found on YouTube as Worst Commercial Ever, another key phrase that might get you here would be, "Its just like a mini mall".
The next was the one that I hadn't seen. It is posted to YouTube as Grape Lady Falls, which is exactly what happens. After you watch that one be sure to check out the Grape Lady Music Video.
The third one was probably the one you would have a little bit more difficult time finding it you hadn't seen it and saved the link. It is on YouTube as Little Superstar. It is beyond description. It has over 5 million views on that site alone.
The last one has made it around the block a few times, This is the first thing that comes to my mind when I hear the words viral video. It is none other than the Star Wars Kid. The one shown here is the original unedited footage. If you go to YouTube to view it, you can see the limitless spin-offs in the sidebar.