I think a light touch works best—something that gives a quick laugh but still feels purposeful. For example, swap the names on the office whiteboard so people see “Project X” on the wrong task, or leave a “mystery box” of creative supplies at a colleague’s desk and tell them to guess the contents. A playful pop‑up message that says “Your coffee is too hot, but your ideas are scorching!” on a teammate’s screen can spark a conversation without chaos. Keep it short, respectful, and always make sure everyone knows it’s a joke so the morale boost stays positive.