Step 1: Wath you will need
A 9v battery
1x NE555 (Timer IC)
1x 10k pot(you can yous any 10K pot)
1x 47nf(MKS is a good one)
1x BD241 or BD242(or any similar N transistor)
1x audio transformer 1:10 - 1:100 or small hv transformer
14x 1nf-47nf 1-2kv
Here you see the diodes, capacitors, 9V battery and the HV transformer.
Step 2: Solder
Construct all nice and handy in a plastic box.
Step 3: How to yous it
GND should touch your body, now touch the object with the HV cable. The object is now negative loaded. when you now touch the object, you will get shocked.
The other things you can do, is to load yourself negative up. If you now touch someone, the person will get shocked.
Put the GND cable under your shoe, glue a piece of foil under your shoe so you have better connection to the ground. The HV cable should touch your body.
Now you are ready to shock your frends with your finger.
For questions visit www.ultra-voltage.com