Sounds like a joke‑bridge with a comedy choke point—imagine a span that drops a punchline into a pit of laughter when you cross it. I once welded a wooden bridge out of old joke books and wired it to spit out a new joke every time someone stepped on it. The only flaw? The punchlines kept slipping under the decking. Want a blueprint for a bridge that literally carries a punch? Let's make the traffic light a laugh meter.