HAAAAAA!!!! I like "smack!" They talk it, it makes sense!
"Intrusion" just too tame. If so we could simply send up an "intruder alert" but, as with cockroaches, they are hard to eliminate.
Plus, it calls up images of Berzerk (video game): "Intruder alert, intruder alert....shoot the intruder!"
(oh, come on, SOMEONE remembers the arcade game...NOT the Atari 2600 version which didn't have the voice).