Anything cool to do with old car batteries??

[J3M93]

Make a Bonfire

Chuck the batteries in

Run like a motherfucker

See what happens

[browntown]

I think I'm up to two or three old car batteries taking up space in the garage. I know the local scrap yard will give me 10 cents a pound, but they have to be good for something more devious.

Youtube showed shocking a kids nipples (with my luck the f*cker would arc right through my heart and kill me), and some guy arc welding with 36volts. Neither sound that exciting.

Any practical or fun uses for car batteries? Or should I just scrap them?