While I'm sure you can point to any number of video games, TV shows, movies, books, etc. which feature stout, "trashbin"-style intrusion detection robots, it pleases me greatly that the Microsoft campus in Mountain View, CA is now using REAL whistlers! You remember these fellows from our favorite games, right?
Here are the tracer/whistle/informer from PSII:
The whistle (now called the whistler) and tracer reappeared in PSIV:
And here's the real deal (called "Knightscope K5", very sci-fi), with a sleek 21st century design.
Fortunately (or maybe unfortunately), the real robots do not zap intruders.