Some guys did this to my college roommate. He would eat anything, as long as it was free. So they gave him a chocolate bar, which he ate without even looking at it. It was a whole bar of Ex-Lax, containing 4 1/2 times the normal dosage. The next day, he was given a standing ovation in the student center as he headed, quickly, toward the men’s room.
Ex-Lax is chemical. That ain’t nice. But oat bran??? BFD.
When I was a kid, my Dad had a problem with someone stealing his lunch at work. My Mom made some cookies with Ex-Lax and put them in his lunch. His lunch never got stolen again ; )