From my attached FAQ:
SPOILERS!
49) How do I play Quarters? How do I get Yumiko's Easter Egg?
While playing Hot Shots, the wheel may come up with the game Quarters. You have to shoot the
quarter into the glass while Yumiko tries to distract you with her boobs. You will choose direction, height and force. If you are able to click the hand when it turns green for all three choices, you will get the quarter into the glass and win the game.
When playing Quarters during Hot Shots, you need your shot to go long and right down the middle to go down Yumiko's dress and get her special scene. Once you start playing Quarters, save the game. When you click, you are choosing a number, with the last two clicks being added together. When the hand turns green, it guides you to hit the glass. Click when the hand turns green each time, and the coin will go into the glass, or at least come close. To get the Easter Egg, you want to shoot past, so let the hand go past the green on the second two clicks, but not too far past. The hand should almost be a fist. You have a 10% chance (the next update will make this a 33% chance) of seeing the Easter Egg if you are clicking just right. When you miss the glass or the Easter Egg, reload and try again.