Zac Efron visited David Letterman the other day while he was in New York City. He talked about bungee jumping a few months back while he was filming The Death and Life of Charlie St. Cloud in Vancouver. "I did kind of a back flip when I went off. Falling face first," " Zac told Letterman, "I did two jumps that day. My dad was like ‘What are you thinking?’ We didn’t tell him on purpose. That was not a good idea.” Check out the rest for yourself.