LOL! That's a good one!
A friend I had, quite some time ago, played an evil trick on his wife. She would play on the computer during the day, when he was at work (she worked evenings) and when she'd turn it on, it would say, in the husband's voice, "wanna go for a walk?" and their dog would go nuts!!! Funny thing is, she didn't know how to change it from that, and he wouldn't do it. Then he'd turn off the computer at night so she'd HAVE to turn it back on during the day. Silly woman, she didn't think of turning off the speakers!!! Every day, take the dog for a walk because of that. At least the dog was happy!