Premise: A saveloy is a type of highly seasoned sausage, usually bright red, normally boiled and frequently available in British fish and chips shops, occasionally also available fried in batter. The word is believed to originate from the Swiss-French "cervelas" or "servelat", ultimately from the Latin "cerebrus"; originally a pig brain sausage particularly associated with Switzerland.
Hypothesis: Sausages cannot be made form pig brains.