Above Average Intelligence.

[V-Adore]

... Somehow I'd managed to forget about potassium being farther down the scale than sodium. I guess high school chemistry was a while ago.

Still: cesium. Consider it, won't you?

[CortJstr]

Still: cesium. Consider it, won't you?

This would make an awesome billboard.

[slink]

Thanks Mr. Wizard!

Sounds to me like the described dumping would have been better accomplished with a large slingshot made of inner tubes, or perhaps a catapult such as Wile E. Coyote would order from the Acme Company so as to acheive the desired potassium immersion yet remain at a remove from the desired spectacular display.

How about say, a hole in the ground!?
Seems slightly more obvious to me. Possibly less fun I guess.
Yes, I'd use your technique on second thoughts.