Cider

Cider is a delicious beverage rare in Ponyville, only made once a year, by the Apple Family. It's only appearance so far has been in The Super Speedy Cider Squeezy 6000. Everyone in Ponyville waits in line each day to buy it. Pinkie Pie is always up early to be first in line to buy it, unfortunately with Rainbow Dash always being last and not receiving any, to her frustration. The cost of a mug of cider is two bits.

Importance in the episode
Cider is central to the plot of the episode, as the Apple Family and The Flim Flam Brothers have a one-hour contest to see how much cider they can make. The race ends with the Apple Family being victorious.

Addiction
Rainbow Dash is in love with cider, possibly more so than anyone else, due to not being able to buy any every year because Pinkie Pie always gets in line first. Rainbow goes to extremes to get cider in this episode. She finally gets cider at the end of the episode, Pinkie Pie gives her a mug when they run out. Everyone in Ponyville is addicted/in love with cider, as lines that go as far as hills in the backround are lined with ponies.
 * Waking up Fluttershy to be first in line, only to find Pinkie Pie there first.
 * While her cider mug is spilled on the ground, she eats the dirt that absorbs the cider.
 * Breaking into tears when she is the last one and doesn't receive any.