How important is a job title to the recruitment process?

How important is a job title to the recruitment process? I was talking to a client recently about a job title for a new post. I explained that in order to attract the right candidate for the role we needed to advertise it under a title that our target candidates would be looking for and respond to.
She was very disappointed as she wanted a ‘modern’ and exciting job title to match her modern and exciting company. You know the type “Jedi, Master, Guru etc.”
A top tip for attracting the right type of applicants to your role is putting yourself in their shoes. If you were applying for the role what title would you be looking for and respond to? This will often depend on what their job title is now.
Be careful of advertising obscure job titles as you will not get the response you are hoping for. Keep it simple. You can always advertise it under one job title and then use an internal title if you must have something sexier when that person is in post. But the important thing is to find them first.
What are the weirdest job titles that you’ve come across?