These are two clips taken from the 30th Anniversary 1080p Blu-Ray version of the 1985 movie Weird Science. While each of these scenes have been posted on this forum before, I've never found them before in this high of a resolution.
Both clips come about 50 minutes into the movie, when our heroes Gary and Wyatt try to create a second girl with Wyatt's computer. When they hit "Enter", all sorts of magical chaos occurs throughout the house party, and among them are these two bits:
1) A bathroom starts spinning around, and the girl inside flashes us a nice upskirt as she tumbles up the wall and onto the ceiling. The clip is only about 4 seconds long.
2) A girl playing a piano holds on for dear life as all the furniture, and then her clothes, are sucked out the chimney. The girl is Kym Malin, who was Playboy's Playmate of the Month for May 1982. She apparently did her own stunts, and when she is sliding across the floor after being stripped down to nothing but her panties, the image quality is so good you can actually see the harness on her lower back! This clip lasts a little less than a minute.