A Doctor
A doctor is a guy who wears bowties, has a temper, and says ‘I’m the optimist’ while saving the world.
My doctor wore a bowtie and saved the world, but he yelled at me for eating too much cake.
The doctor yelled at me, then saved the world, and then I got a fez.
My doctor said he was the optimist, then yelled at me, and then I had to run from a Dalek.