i've called home to leave a reminder for myself about something for later that evening or to bring for work the next day. a few days ago i was sitting quietly in the kitchen doing bills, the machine went off, from 2 different directions 2 cats came running to check out the message, then they left to go do cat business elsewhere in the house. the dog never moved from his nyla bone gnawing, one cat slept through it and the fourth cat never showed up.