Mcdonalds claims to sell 2.5M cups of coffee per day - ten years of sales at that rate would be 9.1 billion cups. 700 reports works out to a 0.00000767123287671

Mcdonalds claims to sell 2.5M cups of coffee per day - ten years of sales at that rate would be 9.1 billion cups. 700 reports works out to a 0.000007671232876712329 percent chance. Even with generous fudge factors for daily cups sold, 700 incidents over 9.1 billon servings is nothing. It's a 1 in 13 million chance. To put that into perspective, your lifetime chance of being struck by lightning twice is 1 in 9 million. So yes, I'm still going with user error. People can be dumb.