andy choi of our milwaukee station has our story. >> jump. >> i don't know.ople in. it's a really unique thing. >> leap of faith for teens looking to find their summertime sea legs all while trying to stay dry. >> i don't thinning i if it happens it happens. >> they are literally. jumping at the chance to make special deliveries as mail boat jumpers. a lake geneva tradition more than 100 years old. >> whoa. >> actually started in 1916. in those days necessity. this was a summer resort for wealthy. but wilderness. >> may bea novelty today. but the dozen kid trying out for the summer's six jumper spots. remain laser focused they deliver mail from a moving boat from pier to pier. >> run faster than you think that you should be. because, you'll be running and, say i'll make it back. turn around the boat will be almost gone. >> auditions are grueling test of speed. agility and confidence. obviously not every dry run -- is a dry run. >> whoa! >> i have not fallen in trials period. fallen in three times total. during the season. >> in an can't keep up with snapchat.