Deadly Whiskey

A man of 18 was arrested for mixing washing up liquid in his superiors whiskey bottle that was left in the refrigerator.
His superior drank the new cocktail and ended up in hospital but still alive.

The man said that is superior kept picking on him making him wash the toilets repeatedly - he wanted to make his superior "taste his own medicine."

Have you done anything like this to get your own back on somebody?
I put soy sauce in my nephews coke which he drunk but that's about it ^^;
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