Because 7 8 9.
A co-operating system.
Paul Walker only crashed once.
Because 10 11 12.
A Def Leppard.
Nothing because ghosts don't exist. Edit:Holy crap I just realized I didn't post this on /r/antijokes.
Because they can't compete with an invisible power that actually exists
Hey Microsoft, why is there no Windows 9? You've given us 7 and 8, and now you're skipping straight to 10?" "Well, to be completely honest, 7 8 9."