I was a surgeon but I just couldn't cut it.
Then I was an anesthesiologist, but all my coworkers were passing gas so much that I had to leave.
So then I became a pathologist, but that whole career just seemed dead.
Then I became a urologist, but all day I had to deal with a bunch of d*cks and a**holes. [doh!]
Next I tried my hand at being an infectious diseases specialist, but I just got sick of the job.
I tried my hand at being a pediatrician, but everyone was so childish.
I worked for awhile as a gastroenterologist, but I just couldn't stomach it.
I thought about trying to become a neurologist, but I just didn't have the nerve.

So now I am an oncologist. I didn't like it at first but it's starting to grow on me.