Who said "Humor is a luxury I cannot afford in times of war."?

This quote is attributed to Drogon.

Humor is a luxury I cannot afford in times of war. - Drogon

"Humor is a luxury I cannot afford in times of war."

Drogon Humor

"I am fire. I am death."

"Dracarys."

"A dragon is not a slave."

"I will burn them all."

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."