We filmed a scene at 4am in a bar that was already closed for customers but had an easy entrance to the terrace so we snack in and filmed the scene in a record 10 minutes time. I used to work there so I hid my face with a scarf in case there'd be any hidden cameras or the cleaning lady inside the bar, since someone forgot to turn off the TV and put the chairs on the tables - it let me think there was smn there, which scared a crap out of me!
