<human>: This was a revenge exacted by one of my roommates in college (we'll call her R1). R1 had been recently diagnosed with celiac disease and had to replace all of her food with expensive, gluten-free things, and my other roommate (R2) and I gladly allocated her a portion of the kitchen to avoid cross-contamination. Having a sweet tooth, R1 would frequently make gluten-free cookies or brownies (the mixes for them averaged about $8 for a tiny box), and she noticed they started being eaten by someone that wasn't her or her SO. R1 asked me about it first (we were good friends), and obviously I wasn't (my mom has a mild form of celiac so I knew how inconvenient it can be), so it had to be R2 and possibly her SO. R1 and R2 didn't get along too well so she didn't really want to confront her about it, so she tried other, nicer things to get R2 to stop.

For a while R1 just tried writing "GF" on her baked goods, even going so far as to write "GLUTEN FREE - PLEASE DON'T EAT", to no avail. After a few weeks of this, R1 decided she'd had enough, and she let me in on her plan so that I wouldn't get caught in the crossfire. R1 and her SO made a batch of regular brownies and mixed in a shit-ton of laxatives. She set it out on her counter as usual and wrote "GLUTEN FREE - PLEASE DON'T EAT" on it as usual. Before long it started to disappear. Then it stopped disappearing about halfway through. R1 never had trouble with her sweets again.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Roommate 2 kept eating Roommate 1's super expensive gluten-free cookies and brownies. Roommate 1 made a batch of brownies with laxatives. Problem solved.*