I fixed an electric fence.
When I was out walking one day I found a rusted old electric fence unit hanging on an old post, obviously abandoned. Being the freak that I am, I took the thing home with me.

Upon opening the thing I noted a wire that was loose. Inspection showed a blob of solder that had no wire, so I stripped off the insulation and re-soldered it.

As it was the sort that runs on a 6V battery, I looked around my room and noticed a 6V transformer and did a quick ghetto-rig on it. I flicked the switch on the unit and this little wheel thingy started rotating and bouncing against a small contact.* Puzzled, I picked up the unit to take a closer look, and turned it over in my hands as I did so.

And no, I didn't notice the little terminal sticking out from the bottom until I had my hand on it. Full dose of zap from one hand to the other, causing my pulse to go WHOOMP.

My arms hurt for days.

*for the technical geeks out there: the wheel thingy was interrupting the current from the battery to power the transformer that makes the zap. You have to have a collapsing magnetic field to make a transformer work, which is fine with alternating current- but that trick doesn't work with direct current, so you have to break the current by means of a buzzer or some other device. The wheel thingy was the other device. I worked all of this out after I stopped screaming.
( The Resident Loon Not a demographic. Do not measure., Wed 2 Jan 2008, 16:58, 4 replies)

Well
we all need a hobby?
(Bear Pookie The Frankly Challenged. Halloween is coming to town., Wed 2 Jan 2008, 17:32, closed)

Watch out!
GEEK ALERT!!!!
( girlinthehole, Wed 2 Jan 2008, 18:11, closed)

Yup, it's true- I'm a geek.
On the other hand, I do have fun with it. I once found the vibrating motor from a pager on a sidewalk and mounted it on a pair of bent paperclips. When you turned it on it would go buzzing around the table.

I named it the Spazzbot.
( The Resident Loon Not a demographic. Do not measure., Wed 2 Jan 2008, 19:19, closed)

Battery/PSU
At a guess (well, not really) a crappy wee dry cell battery is good for a lot less load supporting ability than an AC supplied mains transformer, you got really lucky there I reckon.
(Benzyl, Thu 3 Jan 2008, 3:23, closed)