So I drew this cause of the joke in Read it and Weep.
And here I go at trying to explain what is happening.
Anyways, what is going on in this picture is Rainbow Dash dropped a hollowed out (big) egg on Twilight.
Enraged, Twilight summons a thunderstorm to shock Rainbow.
She just hasn't noticed it yet sense she is busy rolling around and laughing.
How was that?