Petric: [Darko's] eyes glow red, Rene!! There's no telling what dank pit he crawled out of!
— The Stupiders, "Go With The Glow"
The Doctor: His eyes turned red...
Donna Noble: What's that mean?
The Doctor: Trouble.
So lay down|The threat is real
When his sight|Goes red again
"So, is fire engine-red a natural eye color?"
— Phil, All Grown Up!
"When a mongoose's eyes grow red, he is angry."