Planet of the Apes (1974) - Episode 5: The Legacy: These guys are unstoppable! Making batteries now? For all my chemistry classes, I doubt I ever could've made a working battery.
And the speed with which they can pull down and build up a huge pile of rocks, cobwebs 'n' all. ;-) That cityscape matte painting wasn't the best background either; I'd be headin' toward it, if I were them. Those buildings looked pristine, glass intact.