OK, Fluttershy, let's review your prank. Do you know what the major flaw is?
Nope, the opposite, you didn't yell loud enough. If you really want to startle somepony, you need yell at least this loud! (transform)
Let me hear you say AAAHHHHHHHH!!!
That's close enough!
(To see the reference, you may take a look of this video:[link]
After reformed, Discord finally persuade Fluttershy into playing some harmless pranks to her friends.
Rarity: you're here
Thanks for featuring on the Equestria Daily.