From sucking at fluid dynamics to sucking at a straw (in one milkshake)

Today at breakfast, I realised that the amount of energy required to drink a constant volume of milk shake through a straw is directly proportional to the viscosity of the milk shake and inversely proportional to the fourth power (not square) of the radius of the straw. With this realisation, my fear that I will never be able to apply fluid dynamics to real world problems, has been laid to rest.