The sound of a soda can or bottle opening can be heard across the house.
The sound (or smell) of chocolate being eaten can be detected no matter where you try to hide with it.
Pregnancies can not be disguised in this house ... with children guessing within days of the positive test. (No I am not pregnant.)
And there is absolutely no way to disguise the sound of legos when you give them as a gift. Unless you open the box and individually wrap each lego block in tissue paper, it only takes one little shake to give the gift's identity away. Sigh. That won't be a surprise tomorrow.