T-Rex: Every nation has its own flag (all second place to the Seychelles flag, obvs), but it turns out every letter of the alphabet has its own flag too! Alphabet flags, you guys!
T-Rex: Holy crap! When did the world get so awesome?
Dromiceiomimus: You mean semaphore flags, where you move two flags to represent letters?
T-Rex: No man, this is way better: you can actually buy a flag that doesn't look like a "J" but that means "J" and fly it above your house! Isn't that awesome? You can spell out words with flags! "SUP BROS" you could say, and should the bros read it they might reply "sup". Boats use 'em for chatting each other up!
Utahraptor: Your "J" flag doesn't just mean "J" though!
T-Rex: Say whaaaat?
Utahraptor: What what! Sailors also use them in SECRET CODES, and they have public meanings too: "J" means "J" but also "I am leaking DANGEROUS CARGO, stay back!"
T-Rex: So awesome!
Utahraptor: Honestly, you should fly an "X" flag above your house! That means "Everyone, stop what you're doing and WATCH FOR MY SIGNAL."
T-Rex: Man! How come my high school guidance counsellors never said "Be a sailor, THEY'RE AWESOME"? Maybe - maybe they wanted all the sailor jobs for themselves?
Off panel: My friend:
Off panel: It is the only explanation that makes sense