It is always worth remembering that adults were kids once upon a time and for that reason when it comes to pranks, they can be pretty good at them.
This kid was happily showering away when his dad came along with a glass of cold water and a scary mask. The boy can be heard happily showering while singing along to his favourite song before his dad approaches.
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I am not sure what is more amusing, the scream of the boy or the splash as he falls over.