Betty signals to the headwaiter in a restaurant, and says, ”There is a fly in my tea.” The waiter says ”No problem Madam. I will bring you a fresh cup of tea.” A few minutes later Betty shouts, ”Get me the manager! This is the same cup of tea.” How did she know?
Hint: The tea is still hot.


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SEE THE CORRECT ANSWER BELOW:
Betty had already put sugar in her tea before sending it back. When the “new” cup came, it was already tasted sweet.