After buying a fair quantity of coffee, Brewster will add pigeon milk to the drink, which appears to be better tasting than the usual coffee he serves. The coffee has no effect on the player, but after a while Brewster will appear to be friendlier towards the player, which will eventually open up the option for him/her to store the player's gyroids, as well open up new conversations with Brewster. Coffee costs 200 Bells.
In Wild World, you can not buy coffee if the player is in another town, or if you have guests in your town.
In Animal Crossing: New Leaf, after drinking 3 coffees, Brewster will allow to player to get coffee to go through the counter the following day, then the player will be able to hold it outside as a held item, and drink it by pressing A. It will be fully consumed and gone after 5 drinks. After purchasing 6 coffees, Brewster will allow the player to work at The Roost serving coffee to animals in the village, with each one having their own coffee preferences. Depending on how good of a job the player does, they will be awarded coffee beans of various qualities (whose only use is to be sold). They can also receive coffee themed furniture by getting many orders right. The furniture has no use except for decoration.
- 'Pigeon milk', or 'crop milk' is a substance that is produced by all pigeons and doves, as well as some flamingos. Crop milk is produced in the 'crop', which is where birds store food temporarily. It is almost nothing like mammalian milk.
- In Animal Crossing: City Folk and Animal Crossing: New Leaf, on Valentine's Day, coffee changes into hot chocolate, and Brewster is a little more open to the player.
- In a conversation with a uchi villager, they may ask Brewster during the winter, "Hey, Brewster, that winter blend you were working on... What did you end up naming it?" Brewster will either respond with "...Winter Coffee.", "...Winter Storm.", or remain silent with "..."