Absurdly simple, like most riddles when you see the answer.

“I heard of that bloodthirsty old murderer Josef Stalin inviting all nations to …”

“The leaves were long, the grass was green,The hemlock-umbels tall and fair,And …”

“Thank you, Sam," he said in a cracked whisper. "How far is there to go?"I don't…”

“I want to see mountains again, Gandalf, mountains, and then find somewhere wher…”