Day 3's prompt is 'Draw a pony bursting with emotion / Draw a pony who can't contain themselves'. I wracked my brains, but I wasn't satisfied with what I drew at first, so I decided to take the prompt at face value, and draw a pony literally unable to 'contain' themselves.

Pinkie's well-known for popping in and out of unlikely places no normal pony can fit inside, but sometimes I like to imagine that that power fails her at times, especially after she's had an especially big meal. She had brief difficulty getting herself out of the vase she hid in during Fame and Misfortune, so I went off of that, lol.
And I added Twilight because she's the most likely to point out Pinkie's taking things too literally again. =P