" And if we don't have Energy runes, we'll have to get our energy the old-fashioned way."
Mark looked puzzled. "Drugs?"
"Chocolate," Emma said. "I brought chocolate. Mark, where do you even come up with these things?"
Mark smiled crookedly, shrugging one shoulder. "Faerie humor? "

― Cassandra Clare , Lord of Shadows (The Dark Artifices, #2)