Revenge is a dish best served wet
Few years back a coworker was complaining someone was stealing his lunch out of the company fridge. So one day he puts a powerful laxative in his sandwich. Sure enough, come lunch time, his lunch sack was gone from the fridge.
Later we noticed the office quiet guy, the one always kissing up to the boss, making multiple runs to the rest room! So technically, this was not illegal, was it?
Laxatives have their place.