You eat the pie. The words "POWER UP GET" appear inexplicably above your head in blocky white letters. You snag a handful of pixels from the message before it fades away.
The words "POWER UP GET" after using the item could be a reference to the Japanese version of Super Mario Sunshine, where the words "SHINE GET" would be displayed after collecting a Shine.
"POWER UP GET" may also be a reference to a common translation error in video games, where "<item> GET" is displayed after getting an item, due to the fact that the verb is placed at the end of the sentence in Japanese grammar.
The description refers to two Bad Religion songs, 21st Century (Digital Boy) and Sorrow. The chorus to Sorrow ends with the line, "And there will be sorrow no more."