My favorite example of this was the major outage at a Swedish futures exchange in 2012 where the system wound up treating an unsigned order quantity as "negativ

My favorite example of this was the major outage at a Swedish futures exchange in 2012 where the system wound up treating an unsigned order quantity as "negative" and placed an order for 4 billion futures contracts: https://www.reuters.com/article/markets-sweden-bug-idUSL5E8MTB4I20121129 https://www.reuters.com/article/markets-sweden-bug-idUSL5E8M...