Whats the difference between a lightbulb and a pregnant woman?

You can unscrew a lightbulb!

The other day i was in the pub when the waitress approaches me to take my order,
I noticed she had two black eyes

she asks 'what would you like to order?'

I replied with what i wanted to eat, making sure to speak very clearly and loudly because it was obvious she wasn't a great listener!