The Greyhound depot. The Amtrak station. The commuter park-and-ride lot. The suburban shopping mall. The Yankees game. The turnpike toll booth. Your subway or tram system. City Hall plaza on New Year's Eve. The Miley Cyrus concert. The Six Flags park. Any NASCAR event. Ferry boats. Cruise ships. The Macy's Thanksgiving Day parade. National parks. Your neighborhood Safeway. All post offices.

For a start.