Typing "Jet Jaguar" will display the message, "PUNCH, PUNCH, PUNCH".
Typing in any other Kaiju like Mothra, King Ghidorah, or even King Kong will give you "System cannot confirm or deny the existence of this lifeform." In other words, yes.
If you try to cheat and type in "Show Trailer" or "Spoilers" it will respond with "Did you really think it would be that easy?"
Typing in "Roar" will produce "SKREEONK!"
Typing in "IhateGodzilla" will produce "The data you entered is incorrect."
"Knock Knock" produces "M.U.T.O. already knows who is there."