>>8718661Sweden's got the right idea actually. The pulses hurt, but do no lasting damage.
>>8718653If you're nowhere near a farm or stables you can still improvise. The piezo clicker from an electric lighter or barbeque sparker would give you a little jolt, the capacitor from a disposable camera (if you can still find one for sale) would hurt more.
Licking a 9v doesn't really hurt, it tingles more than anything else.