The following is an alternate ending to My little pony friendship is magic, season 6, episode 15, 28 pranks later
Rainbow dash sat on the floor, holding a box of cookies like a shield, her heart was racing, she was breathing fast, tears were pouring down her cheeks, and her eyes were darting to each pony slowly inching there way to her, step, by step. Her mind was like a broken record, saying the same thing over and over "im gonna die, im gonna die, im gonna die". All Rainbow wanted to do was have a little fun, by harmlessly pranking ponys in ponyvillie. Her greatest prank yet was to replace all the Cutie Mark Crusaders cookies, with her own special kind with rainbow filling, that would stain a ponys mouth. Rainbow remined herself "what did i put in those cookies, flour, water, eggs, the filling, it gotta be the filli...oh no". Rainbow remembered what the filling was, it was zap apple jam, and rainbow spectra. Rainbow dash mixed the jam with a little spectra for the staining effect, and just a little, so the cookie wouldn't be to spicey. "the spectra must've made the ponys sick, and somehow, zombiefied them". Rainbow still had to worry about the matter at hoof, she didn't know what to do, she was cornerd in applejacks barn, and had nothing but, cookies, these cookies, Rainbow pondered to herself "mabye i could, no, it take to long, and, i dont even, oh celestia help me, SOMEPONY HELP ME!" she screamed at the top of her lungs. The ponys, no, the zombies kept inching forward, the zombies rainbow mouths were being replaced with blood, driping from there chins. Rainbow dash wished she had a gun or somthing to end it, but all she had were these stupid cookies, that would take to long to zombiefy her. The zombies were just and few inches from her now, this was it. Tears poured down her face as she wimperd "im sorry, im sorry everypony" she then closed her eyes tightly. The zombies then kneeled down to her and started biteing. Rainbow dash screamed and scwermed in agony, each bite taking a chunk of her flesh, then one zombie pulled of her leg. She screamed evan louder, her eyes bolted open and then, her scream of pain suddenly stopped. Her face was frozen, the zombies continuing to pull Rainbow apart, limp by limp, one zombie then finally pulled her head off. Rainbow was nothing but bits and peices and a pool of blood where she once sat, and boxes and cookies splaterd with blood. Once the zombies finshed enjoying there feast, they then starting walking out of the barn, traveling in random directions. The entire population of ponyvillie was infected, and they were traveling to different settlements in equestria, and since it was nighttime, many ponys would be asleep, and would not be ready for the Trotting dead, that was coming for them.