lol, mine barked at my sister one time, I thought it was our dog at first, but he has such a big bark I thought "no way!"  Then my ferret did it again XD.  Was SO frickin funny after I figured it out, I just wish they'd do it again XD.  It's like one of those moments where it happened, and it shocked you, so you need to hear it again just to know it was real XD.