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Old Time Tricks are the Best!
Roll a piece of newspaper into a paper cone.
This would normally hold something dry like popcorn or candies.
With some super magic power it will be able to hold liquids.
Milk is poured into the paper cone from the Milk Tumbler.
Suddenly the performer collapses the cone and the milk vanishes!
The paper is not even wet! Very Clever construction of Tumbler.