This is a sign I came across in downtown Jyväskylä, Finland. It was placed on the side window of some commercial building.
Usually when you see a sign about an alarm system, the sign depicts a CCTV camera. What caught my attention here is that we have an actual burglar entering through a window and an alarm bell going off.
This feels to me to communicate a very different thing than a sign that shows an icon of a camera or an alarm. Or a sign that just depicts the name of an established security company. Such signs seem to live in the realm of implying "burglars don't need to bother trying, we are watching". But the current sign focuses more on the "if a burglary happens, it will be caught". In particular it seems to focus less on prevention and more on consequences (and implied punishment).
It also feels that this sign is a bit more threatening, in a way. I often imagine that these types of signs have two target audiences: the burglars and the people worried about burglars. And the message to the people worried about burglars does include the warning that "there are burglars that might try to rob you", with an implied "you need to buy security from us".
In any case, this was a refreshing change to the more standard "here's an icon of a camera to remind everyone that this area is being monitored". Though in reality even then the situation is a bit more nuanced.