You know what would crack people up? A tiny, modular “smile‑spark” device that plugs into any Wi‑Fi network, emits a harmless low‑frequency hum, and then lets you see—through your phone or a smart glass—real‑time ripples of other people’s smiles in a shared virtual space. Each time someone laughs or smiles, the device flashes a tiny light and sends a “pulse” that syncs up to a collective beat. You could even queue up a playlist that changes color with the mood. It’s like a global, low‑stakes, instant social‑distancing dance party. The tech is simple enough to build from off‑the‑shelf sensors, but the social payoff? Huge.