Hmmm.... Haflinger might work. It's close enough that people will probably get the reference.
“I've got chocolate chip, oatmeal raisin, and quartz chunk. You probably don't want the quartz chunk though. Twilight had one once and chipped a tooth. They're on another plate..”
“Chocolate chip, duh!” She skipped down the stairs, and stopped dead as she saw the plate of cookies on the table. Her face went white as a sheet and she gasped as if she had seen a ghost, or maybe a zombie. Zombies were scarier than ghosts. “D-did you put both the chocolate chip and oatmeal raisin cookies on the same plate!?”
“Um, yes.”
Pinkie reared up and flailed her forelegs. “NOOOOOOOOOOOOOO!!!!”
Spike just stared. “What's the big deal?”
“You never put oatmeal raisin and chocolate chip cookies on the same plate! If you eat one, you don't know which one you're getting and you always always always pick the wrong one! Do you know how awful it feels to take a bite of what you think is going to be a sweet and ooey-gooey-chewy chocolate chip cookie and realize that it has raisins? It's one of the greatest disappointments in life, right up there next to not getting into the Wonderbolt Academy or being sent back to magic kindergarten!”
Spike blinked. “That bad, huh?”
“Well, maybe not that bad. But it's still pretty bad.”
“Can't you just like, smell the difference or something?” Spike asked. “Raisins and chocolate smell different, don't they?”
“That's just what they want you to think!”
“What who want you to think?”
“The cookies! They want to trick you into eating the wrong ones!”
“Why would the cookies care?” Spike scratched his head. “Don't they want to be eaten?”
“Exactly! That's the problem!” Pinkie stomped her hooves. “The oatmeal raisin cookies want to be eaten, so they try to smell like the chocolate chip cookies! Sometimes they even smell more like the chocolate chip cookies more than the real chocolate chip cookies. They're very devious.”
“Yeah...”
“But the chocolate chip cookies know that, so they start trying to smell more, too! Unfortunately, the Oatmeal Raisin Confederacy tries to counteract it! They infiltrate the ranks of the Chocolate Chip Alliance and leave raisin smell everywhere so you'll think that the the chocolate chip cookies are the imposters! But they know that you know that they do that, so they leave some of the raisin smell on themselves so when you pick up a cookie that you think is a chocolate chip cookie that smells like raisins, but it's actually a genuine oatmeal raisin cookie! Watch!”
She leaned in close to the cookie bowl and began to sniff. “Hmmm... see?” She picked up a cookie, and balanced it on her hoof. “It smells just like chocolate!”
“So, does that mean it's....”
“I have no idea!” Pinkie declared. “It's my theory that right now, this cookie is neither chocolate chip nor oatmeal raisin! It currently exists in an unknown state, which will only be determined when I take a bite. At that point, it will turn into whatever cookie I did not want.” She took a bite, and her face scrunched. “See? Raisin!”
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Like turtlebutter has the princess thing, my feminist 
