He went ice fishing where?
Jack tells Rose a story in an attempt to talk her out of taking her own life by jumping into the river. In one tale, he claims to have gone ice fishing in Lake Wissota, which is close to Chippewa Falls, to alert her to how icy the water would be.
Now, the main reason this narrative is interesting is that it makes no logic. Five years after the Titanic sank, in 1917, the Chippewa River was dammed to create the artificial reservoir known as Lake Wissota. Was Jack fabricating a tale to dissuade Rose from jumping, or did he really arrive from the future?