When OP gets a job offer to take part in a possibly groundbreaking experiment, he jumps on the opportunity without any knowledge of how much impact it would have. Then let us see how a thoughtful action could ruin the family dinner. 

The original posts can be found here: 

https://www.reddit.com/r/nosleep/comments/10qveia/the_countdown/

https://www.reddit.com/r/AmItheAsshole/comments/10q7zhu/aita_for_making_homemade_food_for_everyone_except/