Stacking Cups

One of Cassandra's favorite toys is her stacking cups.  If we stack them to put them away, she loves to take them apart and spread them allover the room.  If we stack them into a into a tower, she loves to come knock it over.  Sometimes she knocks the tower over different ways.  She can  knock them down, grab a cup on the bottom, or press down on the top cup until the tower explodes out in some random direction.

However, she has come up with a way to play with them that I don't think the manufacturer intended.  The cups have holes in the bottom to allow them to drain so they can be used as a bath toy.  Well, little Ms. Cassandra puts the cup over her mouth and under chin and uses the cup to whistle.  Took Daddy a while to figure out where the noise was coming from.