Fluttershy didnt think shed ever be funny enough for Pinkie Pie.
 
After all, she hadnt been a very good Pinkie Pie. She wasnt very good at thinking of jokes, or telling them. But, one day, Pinkie made a silly face at her, and without even thinking Fluttershy made the same face back.
 
Pinkie couldnt contain herself. She laughed so hard that she couldnt even stand up. For a moment Fluttershy was stunned into silence, until Pinkies laughter filled her, and she fell on the floor laughing along with her.
 
In that moment, Fluttershy understood. It wasnt a matter of being funny enough. She didnt have to become somepony else. Pinkie was simply full of laughter, so full that it was always just below the surface and ready to burst out.
 
Pinkie just loved to laugh. And Fluttershy loved to help.