Who said "There is humor in my cursed existence, dark as it may be."?

This quote is attributed to Swamp Thing.

There is humor in my cursed existence, dark as it may be. - Swamp Thing

"There is humor in my cursed existence, dark as it may be."

Swamp Thing Humor

"I am the swamp. The swamp is me."

"What was I? What am I now?"

"The man I was is gone. Only the swamp remains."

"They made me into this... this thing."

"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."