How I finally got my gym- bro cousin to stop eating my food

This happened a few years ago, and it involves my older cousin, Marcus, who was staying with my family for a few weeks

Marcus was a fitness freak and spent all his time at the gym. He was always eating food out of our pantry. I didn't mind at all, but my biggest issue is that he always keeps eating my protein bars that i buy from a specific brand and is very expensive. I bought them with my money from my weekend job because I liked the flavor, and i kept them in the pantry with my name on it. Whenever I confronted him about it, he just laughed it off, saying, "I don't need this much protein," or that "I can't have the same body like him."

The breaking point happened when I had a huge track event on Thursday, and I had saved the protein bar in the pantry so that I could eat it before the event. I explicitly told Marcus not to touch it. When I got home (this was Wednesday), the wrapper was sitting in the trash, and Marcus was on his phone. When I asked him, he simply said, "My bad, I needed a snack after my workout. Just buy more."

I was completely done. I knew that Marcus was impatient and was never attentive to things around him. So i decided to make my own homemade protein bars. I made it using oat flour, peanut butter, and protein powder. But when mixing, I added 3 large tablespoons of bitter baking cocoa powder and a large scoop of mustard powder.

I put them into bars and let them harden in the fridge, and then put it in the wrapper from the day before, making it look brand new.

The next day, Marcus came back from the gym, went straight to the pantry, and without looking, took the bar and took a bite while walking to the living room.

The gross, nasty taste hits him instantly. He looked disgusted and immediately spit it out into the trash can, coughing and gagging and yelling about how disgusting it tastes like.