Especially when R really likes to carry on chugging along with your analysis spitting out nonsense values when it should have failed on something 50 lines ago.

Especially when R really likes to carry on chugging along with your analysis spitting out nonsense values when it should have failed on something 50 lines ago. sum(1, 2, 3, 10) [1] 16 # great mean(1, 2, 3, 10) [1] 1 # wait, what?