My FIL is a little stubborn. He has two strands of electric to attempt to contain his herd of donkeys, that is often more down than not . The jacks like to kick one or both down. And he buys the cheapest charger he can find; I think he has one that he got at a yard sale.
So one day he and his son are out in the pasture by the fence to repair yet another broken wire, and after the repair, says to his son, "This charger ain't workin".
Son: "What makes you say that?"
Pa: "It ain't 'clickin'".
Son: "Well, the little light is flashing, doesn't that mean it's working?"
Pa: "Nah, you can't believe that thing."
Son: "Well maybe the battery is just weak."
Pa: "Nah, it ain't workin; see, watch this." (grabs hot wire with bare hand with no visible affect)
Son: "Well, I guess you may be right, but it probably wouldn't give you much of a jolt since you're not grounded."
Pa: "No, it just ain't workin."
Son: "Well, I bet it would be working a lot more if you were barefoot!"
Pa: "NO! I'm telling you it AIN'T workin!!"
Son: "Well, if you are SO SURE, then why don't you just take off your shoes and try it?"
Pa: (while taking off shoes) "OK, I'll PROVE it to you (proceeds to get knocked on his ***).
Happened maybe 10 years ago and we all still kid him about it. I bought him a fence tester at TSC as a gag gift last Christmas.