Chances are low that a full download would result in problems with your computer. Worst case scenario I think would be that you are not able to download the entire movie after paying for it. Depending on your connection (dial up, high speed..) it amy take longer to download, while downloading it also might slow your system down. I might download one right now actully then go to bed.
I'm watching Paul Blart maul cop and the scene where he gets drunk is hilarious. I ate a small piece of "special brownies" tonight so it makes it even more hilarious. I may download a tickling clip right now. I don't really care for my IT job that I have to be at tomorrow morning. I'm going to be too tired and hung over from a weekend of drugs and alcohol (marajuana and maybe 6 drinks) to be smart at work.