Slinky Drinky PRACTICAL MAGIC EXCLUSIVE
Show what appears to be a white china mug (it's actually melamine plastic).
Pour a good quantity of water into it, and when you turn it upside down, the water has vanished, and in it's place a long colourful slinky drops out!
Slush chamber is removable for cleaning, and magnetically locks inside the mug.
Use it as a gag, or use it as part of a magic routine!