I was a community assistant at my university. One of our responsibilities is to throw programs, which are basically like events, for the freshman residents.
We organized one one about safe and responsible drinking. We thought it'd be clever to hand out drinks and to have someone randomly "roofie" residents by sneaking a Skittles into their drink.
We did it to about 40 students. Not one of them noticed till they got to the bottom of their drinks.
Stay safe people.
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