Just a mugger.

I was walking home from work and I was accosted by a man in a suit and tie wielding a knife!

I exclaimed "Yikes, what do you want?"
The mugger said "Give me your Wallet!"
I replied, "Oh, is that all. You scared me."
Mugger said, "Cause I'm holding a knife?"
I replied, "No, Because I thought you were a investment banker."