Milk

Milk is an item in Paper Mario that also happened to appear a very little time in Mario & Luigi: Partners in Time. In Paper Mario, it is one of the items Princess Peach used to bake a cake for Gourmet Guy. In Partners in Time, up in Yoshi's Island Mountain Top, while Baby Bowser, was eating Yoshi Cookies, he started to choke. Kamek gave him milk from an "evil" cow. Milk was also referenced in Super Paper Mario, where a non-player character named Chap showed a bit of an addiction and obsession with it and often claimed to be drinking it (despite the fact that it was never seen) when spoken to in the Underwhere Bar.

In an old commercial, a few children were playing Super Mario 64, however Mario wasn't jumping high enough. The kids then left frustrated. Mario then jumped out of the TV, ran through the house, made it into the refrigerator and drank the whole bottle of milk. Mario then returned to the TV and was now bigger and stronger. This episode was part of the "Got Milk?" commercials.