Courtesy of Sonya, my Korean roommate:
"So, okay. This doctor has these pipes that break or something, so he calls a plumber. The plumber comes and fixes the pipes, you know? The doctor asks to the plumber, 'So, you make pretty good money right?' The plumber says, 'Yeah it's pretty good.' Then the doctor says, 'Yeah I wish I was a plumber.' And so the plumber says, 'Yeah, cause I used to be a doctor!' Funny, right?"