Can you name an animal whose killing cannot be performed without spilling your own blood?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I can write cow in 13 letters.

Can You?

What's the only room from which no one can enter or leave

Why are televisions attracted to people?

Why is it very easy to weigh a fish?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Which part of London exists in France as well ?