Dr Kruszelnicki is not correct with his probability calculation unless the carton he is referring to is a 4 egg carton. His probability calculation would also be correct if he said: the chances of getting four double-yolk eggs in a row from the 1st four eggs picked from a single carton should be (1/1,000) x (1/1,000) x (1/1,000) x (1/1,000), or one in every trillion.