Is this Joke Funny?

At work today I heard a joke about a car accident - I will tell you the joke and ask the question, 'Is this joke funny?'

JOKE: I was on my way to work today and as I was nearing work I crashed into the back of a car. The car was being driven by a dwarf. He got out of the car and came up to my window ~ then he said, 'I'm not happy you know!'

So I said to him, 'So which one are you then?'