Fuck
One of the most interesting words in the English language today is the word “fuck”. It is a magical word. Just by its sound, it can describe pain, pleasure, hate, and love. In language, it falls into many grammatical categories. It can be used as a verb, both transitive, “John fucked Mary”, and intransitive, “Mary was fucked by John”, and as a noun, “Mary is a fine fuck”. It can be used as an adjective, “Mary is fucking beautiful”.
As you can see, there are not many words with the versatility of “fuck”. Besides the sexual meaning, there are also the following uses:

Ignorance 
  “Fucked if I know.”
Trouble 
  “I guess I'm fuck now.”
Fraud
  “I got fucked at the used car lot.”
Aggression 
  “Fuck you.”
Displeasure
  “What the fuck is going on here?”
Difficulty 
  “I can't understand this fucking job.”
Incompetence 
  “He is a fuck off. “
Suspicion
  “What the fuck are you doing?”
Enjoyment
  “I had a fucking good time.”
Request
  “Get the fuck out of here.”
Hostility 
  “I am going to knock your fucking head off.”
Greeting 
  “How the fuck are you?”
Apathy
  “Who gives a fuck?”
Innovation 
  “Get a bigger fucking hammer.”
Surprise
  “Fuck! You scared the shit outta me.”
Anxiety
  “Today is really fucked.”

And it is very healthy, too, if every morning you do it as a Transcendental Meditation. Just when you get up first thing, repeat the mantra “fuck you” five times. It clears your throat too.