You can tell this little boy takes his magic cup game (in which you hide a ball under one of three cups and shuffle them around before having someone guess which cup it’s under) very seriously. He has to double check that the girl for whom he's performing the trick does actually have her eyes covered before proceeding with the setup--too bad there’s one thing he completely overlooked.
The little girl, on the other hand, immediately sees right through the trick and uses it to her own advantage. Upset and confused by her ability to quickly solve his puzzle, the boy throws his hands up in the air in exasperation before leaving the table in a huff. When you see where he went wrong, you won’t be able to stop giggling. See the whole thing unfold in the short video below.