Yes. Well, not exactly wave guns around, but say and do stupid stuff? Not in a taxi around a human driver, no. And not in a subway car with people other than me and my friends, no. But your question had an “or” in it. If we had nerf guns and no one else was there to witness? It’s not unimaginable that someone might get a nerf dart to the ear when they didn’t expect it.

My wife and I like watching real-life police detective shows. Sometimes we discuss mistakes the killer made, and how we’d avoid them. “I wouldn’t kill anyone, but if I did, I wouldn’t cheap out and keep the clothes I wore to do it instead of tossing them into a river.” Of course we’re not going to do that, but it’s a puzzle to solve, so we try to solve it. We would not have those conversations around a taxi driver or a crowded subway, lest someone overhear and get the wrong idea. On an empty subway or Waymo? Yeah, sure. And if BART or my cab reported us for planning a murder, I’d be livid enough to plan how to murder the computer that made the decision to rat me out.