Dannii Minogue started a new dance craze at an outdoor concert at Kingsbury Water Park near Tamworth when she tried to alert the crowd to a capsized boat behind them.
Dannii waved her arms around and pointed at the lake but fans merely started pointing back at her, thinking it was part of a new dance.
After the show, Dannii said she had wanted to stop singing and shout for help, but was then relieved to see the man, who was an experienced member of a sailing club, was safe.