Workhorse

Terri: She needs to stop working for her husband and find another job.
Kevin: I'll take her job. What is it?
Terri: Working with horses and cleaning up after them.
Kevin: I actually have experience shoveling horse shit.
Terri: Really?
Kevin: Yeah, I could get references even.
Terri: And you have a Masters degree.
Kevin: Except that's practice shoveling bullshit.