Never been to a real doctor

This old mountain woman was going to see a real docter for the first time in her life. After the exam , the doctor tells her to go home and come back in two days with a specimen. When she gets home she ask's her husband what a specimen is. He say's hell i don't know, go up the holler and ask ole lady wheeler, she knows somebody who went to a real doctor one time. The wife heads up the holler , then a few hours later comes back with a black eye, busted lip, and using a stick for a cane. The husband said , what happened to you? She said well i stepped up on ole lady wheelers porch and asked her what a specimen was, she told me to go piss in a jar, so i told her to go fart in a jug, and all hell broke loose!