Some pranks rely less on the setup and more on the pause that follows.
In the clip, an older woman is handed a mug of tea and looks down at it, hesitating as she tries to understand what she is seeing.
"I made a cup of tea for my nan but tipped the mug upside down and put a bit of tea on the bottom of the mug to make it look like a full cup!" the filmer, Roxanne, told WooGlobe.
She listens as the trick is explained and tries to understand what is going on.
The humor comes from how carefully she tests the moment, treating the ordinary cup of tea like a small puzzle.
The scene was filmed in Harlow, Essex.
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