My job takes me to various construction and civil engineering sites, the more remote of which are protected by robotic alarm things, painted to look vaguely police like. They are not, unfortunately, fitted with frikkin lasers, but I did find out the other day that when triggered a robotic voice shouts in its best Norn Iron accent saying "The police and landowner have been informed." Sadly it doesn't say to "fuck off ye wee shite" or "TEETH WILL BE PROVIDED".