Birthday

Celebrated Where: Unknown

Celebrated When: Day of Birth

Celebrated By: Characters that are born

Description
Birthdays in the 31st century are much like the birthdays celebrated 1000 years ago. The words to the birthday song have changed, and the tune is similar but legally distinct.

The Birthday Song
What day is today?

It's _____'s birthday,

What a day for a birthday,

Let's all have some cake

Appearances

 * "I Second that Emotion" (2ACV01): Nibbler's birthday
 * "A Clone of My Own" (2ACV10): Professor Hubert J. Farnsworth's birthday
 * "How Hermes Requisitioned His Groove Back" (2ACV11): Hermes' 10th birthday party is mentioned
 * "Time Keeps on Slipping" (3ACV14): both Amy's and Zoidberg's birthdays
 * "Leela's Homeworld" (4ACV02): Teenage Leela's birthday
 * "Bender Should Not Be Allowed on Television" (4ACV06): Calculon's fictional birthday on All My Circuits, Dwight's birthday, and Cubert Farnsworth's Growth-Scraping Day (which is effectively his birthday)