The file was titled Equine Mind. Jeff thought it would be hilarious if someone slowly thought that they were some sort of horse or donkey. He began writing up his command file, laughing as he typed up how the change would start. Slowly, whoever Jeff chose to change, would start to walk on all fours. As they continued to walk on all fours, their taste-buds would change to crave more fresh food, like leafy vegetables, until they move to eating grass. Their voice would start to become more scratchy and hoarse, as they start to whinny or bray regularly into their conversations.
Jeff stopped. Did he want to completely change the mind so they didn't speak or did he want them to speak still human while braying at any point when they spoke? He pondered this idea for a while...