Grandparents and Grandkids

I found this oneon Facebook and would like to try it:

My mother taught it to me! Unopened can of sweetened condensed milk + 3 hours on low (completely submerged in water) in the crock pot + cool down in the fridge = Caramel! This is the best caramel I've ever had, let alone made! It's so easy! Need to try this! —...JB