A Kimogila?
Anakin: Master, I think my lightsaber is getting dull. Its not doing nearly as much damage as it used to.
Obi-Wan: O.k. when we're done showing the youglings around the temple, we'll stop by the bazaar and you can buy a new crystal. I hope you've got a couple million credits saved up for this.
Anakin: WHAT?!!?? I don't have THAT kind of cash!
Obi-Wan: Well you could try sharpening it on these younglings. I've got a headache and all their questions are driving me NUTS!
Anakin: hmmm.... Sharpen my lightsaber on younglings...... hmmmmmm.....
Obi-Wan: uh, that was a joke Anakin. I'll spot you the cash for a new crystal THIS time, but next time you're on your own.