Because I can.

Me:  Stephanie, get in the bathtub.

Steph: NO!  I WANNA BIG GIRL BATH.

Me:  Um no.  How about we use a bath fizzy tonight.

Steph:  BIG GIRL BATH!!!!!!!!!!!!!!!!!! SHOWER!!!!!!!!!!!!!

Me:  You can have a big girl bath when you grow up.

Steph:  But my teacher says I'm growing NOW!!!!!!

Me:  How about this, you can have a big girl bath when you're taller than me.

Steph:  SO CAN I HAVE ONE TOMORROW??

Me:  ....................no.