If my memory serve me correctly, including these two now we have
- Blue screen of death
- Green ribbon of death
- Endless reboot
- 62% bug
To Linux user, don't be so happy. It still have "kernel panic" problem sometimes.
Moral of the story.
There's no such thing as "Perfect OS". From the software development point of view, there will always be a bugs. If someone said that it's perfect that means it's bullshit, marketing people tends to say this by sweeping the truth under the carpet...