It's crazy out there

You've made it back from a holiday getaway, or maybe you stayed close to home but survived a first experience with holiday shopping.

We won't have an online discussion today, but I invite you to come over to our Discussion Group, called Taken for a Ride, and answer a question for me: What's the dumbest thing you've seen a traveler do (traffic or transit)?

People always ask me if I think traveler behavior is getting worse. I really have no idea. I don't know of a really objective measure that can be used over time. But for today's question, trend lines don't matter. And neither does the action or lack of action by a transportation agency. This one is personal. What's the worst behavior you've seen?