Blogger's Law: as soon as you finally post something, glaring errors will appear.
A derivative of Murphy's Law, the Blogger's law accounts for the inevitability of everything necessary for a sensible online publication going wrong nanoseconds after publishing something on the internet. In spite of all human and machine-assisted efforts to proofread and edit, mistakes and glaring errors will happen for all to see.
Aspiring writer: I finally published our latest blog post!
Editor: I'm not thrilled, did you account for the Blogger's Law?
Suddenly unemployed online writer: $%&#!?! I swear the headline had no typos before I hit publish!