ME

'M' and 'E' are two perfectly normal letters. Non-threatening.  Just two out of a possible twenty six. Put them together. ME. Me, myself and I. Me. A harmless word. Meaning 'yourself'. A word used everyday. But Add a full stop. A period, in the middle. Separating them, that's when they become dangerous.  And they have the power to change your life forever.  M.E. Myalgic Encephalomyelitis.