Kinda geeky but I have an autograph from Seth Rogen and Joseph Gordon Levitt. They did some filming for the movie 50/50 in my town and I waited in line to get their autograph. ( the autographs are both on the same picture )
My most prized possession over the internet was my instagram @satan before it got hacked :/ Now it's my twitter (below). But my IRL prized possession is my family. Just like Eight, they are everything to me!
If speaking in materialistic perspective than it would be my Hunting Knife handmade by my Great Grandfather in the 1920s during the Great Depression. He took it to World War II and probably killed some people with it.