DC Harley Quinn Annual #1

DC Harley Quinn Annual #1, released in 2014, features Harley breaking into Arkham Asylum to rescue Poison Ivy, who is being forced to create a mysterious chemical. During the chaotic rescue, a hallucinogenic gas is unleashed, causing Harley, Ivy, and others to experience wild, individual hallucinations, each illustrated by a different artist. This issue is notable to collectors as a groundbreaking “scent-ticular” comic, originally polybagged to include actual smells integrated into the story.