Care to share your funny, hilarious, shocking... whatever "one typo can change the world" stories?

Do you have any stories in which a tiny typo can change the meaning of the whole sentence? Like when I write “If I pitied him, I would kill him” instead of “If I pitied him, I wouldn’t kill him”, the meaning changes completely and drastically, although I only miss two letters. Or when I write “I eat fork for breakfast” instead of “I eat pork for breakfast”, the meaning changes too, although only one letter is replaced.

Inspired directly by a thread I saw, in which one participant claimed they loved making “sadcastles”, and indirectly by some more personal events.