jumping

Well, the solar car battery charger arrived today and though it only needs to be plugged into the cigarette lighter, Mum got the part-time Warden at her apartment to help her fit it this afternoon.

She rang me this evening to tell me about it.

"I had to get D to help me practice with it."
"Practice what? You just plug it in and leave it, don't you?"
"No, it was jumping. I had to learn how to press it"
"I'm sorry, Mum, you've lost me. Press what? What are you talking about?"
"I've explained it already. The car was jumping. There's no other way to tell you."
"I don't know what you're talking about, Mum. Surely you just plug the charger into the lighter socket and leave it there. What was making the car jump?"
"I was trying to back the car out and it shot backwards when I pressed the accelerator"
"Where was your other foot, Mum?"
"Oh...er....um...the er.... the clutch"
"Sounds to me like you need to practice your clutch control, Mum. This has nothing to do with the charger. Perhaps if you used the car more often....etc"

[sounds of consternation]