a relationship is like a pc
The most uncertain - and critical - period of your pc's life is it's first few boots. It's within that period you can tell if you put the fucker together properly, and tell if any components are failing. Usually, if you get through that period unscathed the only thing you have left to worry about is eventual component failure from wear and tear, but even then it's usually only a hard drive - easily replaced once you kept up with your backups. The mobo and processor are usually there until the end.
heh.