My memory is a little fuzzy since I was so young ... but I think my older sister was getting married and for some reason only my parents could go, so my oldest brother stayed with my sister and me until my parents got back. He was in college at the time I think.
It must have been a Friday night ... he rented and watched Alien. The scene below horrified me and my sister so much that we wouldn't eat our oatmeal the next morning. The video doesn't really show it, but I think the dude was just eating something resembling oatmeal. So my sister and I made the connection in our minds that eating the oatmeal would cause an alien to burst out of our chest.
Anyway - Prometheus is out now and one of these nights I plan on checking it out. Looks just as good as 1979 Alien.