The other night I was carrying Gillian upstairs and I stopped at the top of the stairs and whistled for Duncan.  He didn’t respond to my first whistle, so I whistled again.  When I whistled the second time, I heard Gillian whistle.  Well, she didn’t exactly whistle.  She kinda screeched and made a sound like a whistle.  I thought it was just a one time thing.  But we tried it again, and she did it again. 

Check out this video of Gillian “whistling” for Duncan.  It isn’t until the end of the video where she attempts to whistle.

Every time she does it, all I can think of is Phoebe from Friends.  When Ross is playing “Celebration” on the bagpipes and says “you know the song, sing along.”