[joseflavio]

I am brasilian too, I could find this one [beware of strong images]:

http://www.cidadeverde.com/asssaltante-morre-eletrocutado-do...

The thief tried to break into the a trailer but it had electric fences. The thief died electrocuted and the owner of the trailer is being accused of murder (facing charges and trial).

I remember reading several others like this one, so this is real in Brasil.

[illuminate]

You cannot set up traps on your land in most countries.

[analog]

Yup, as other poster noted this would result in charges against the owner in the UK too.

You can't use deadly force against someone for theft in most civilised countries.

[thisone]

You generally can't use deadly force against someone who is not threatening your life.