The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.
Question #90972 posted on 02/20/2018 5:54 p.m.
Q:

Dear 100 Hour Board,

In cartoon shows, do cartoons exist? Or are all shows in cartoon shows live action?

-Love Ducks

A:

Dear Love Ducks,

Yes, cartoons exist within cartoons. In Phineas and Ferb they watch a lot of a cartoon called Pinhead Pierre, in addition to some other ones. In Board Question 83657, Frere and Tally give some other examples, as well.

-Alta

A:

Dear LD,

In Steven Universe, there's a really strange cartoon called Crying Breakfast Friends!

-Kirito