A glass object filled with water and turned upside down. The exact amount of liquid - in correlation with the glass shapes volume and its opening - makes the water staying for more than a day. Through slight vibrations and over the time it unexpectedly starts dripping slightly. To then, when there is just a little bit of water left, empty rapid completely.
An expectation of dripping that is first not fulfilled and suddenly surprising at a time you would not expect it anymore.