How mean is putting laxative on people's foods?

Ok so yes, I used to do that on some people's foods. I was between ages 9-14 at the time.

The only people I never did it on were my parents, older sister and my other close family member.

A couple people were jerks. At times it was just me just to see them have a stomachache for a day; kind of like a joke.
Update: I stopped doing that though. I was such a naughty girl at the time.
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