I once fucked a girl in the backseat of my car in the parking lot of a McDonalds. Another time I got a bj from a girl on the NYC Subway. But the most public place I've fapped in was a restaurant I worked at during college. I fapped into a creamy broccoli soup right before I quit.
In the Hyatt elevator in San Antonio... interior glass elevator..... drunk and 230 in the morning...security met us at floor 5. quite embarrassing but the guard gave me a high five while escorting us out!!