I’m thinking more along the lines of The Breakfast Club.
When testes grow like that the process happens relatively slowly, allowing scrotal skin/connective tissue to toughen/fibrose. It may help to think about a 500 pound obese human and compare him/her to a 80 pound anorectic humnan. If the anorectic were suddenly to have the 500 pounder’s abdominal contents, her belly would split, showering passersby.
Just like a 500 pound obese middle-aged man eating a wafer thin mint. now I have to watch that movie tonight. blech…