Hey, love the idea! Imagine a pocket‑sized gadget with a tiny LED that flickers in Morse code or a subtle vibration so people get a sneaky wink. Keep it low‑power with a rechargeable coin cell, maybe an ESP32‑S3 for Bluetooth control. It can hide in a pen, keychain, or even inside a shoelace—super stealthy, just enough to mess with their heads. What kind of tricks are you thinking? A prank button, a surprise sound, or something that changes the environment subtly? Let’s nail down the vibe and make it look like nothing at all.