Leave it to Japanese graphic design studio D-Bros to make opening an envelope even more fun than reading what’s inside. “Booooon!” (an onomatopoeia often used by children to imitate the sound of vehicles) comes with an illustration of an automobile, locomotive and airplane. When torn open they create trails of exhaust plumes!
For 945 yen you can purchase the set of three. If you’re not in Japan, you can use an export service like white rabbit express.