Baby Steps on Black Ice

My dad called me up last night and told me that it was icy out and that I should be careful not to slip on the ice. I thanked him and we hung up. Then he called right back immediately. This is what I call the double or triple phone call. I have taken on this crazy habit. It involves calling someone up and finishing an exchange, then needing to call back and repeat the information. The second time he asked if I had heard of "what they call" black ice, meaning a sheet of ice that can't be seen. Then he told me that I should walk slowly. I thanked him and then he called back a third time. During the final phone call he explained what "walk slowly" meant. He said that I should take very, very tiny steps, moving only one foot at a time.