real story;
string sender = "Robsão";
Colleague: Did you see it? That field doesn't allow letters, only numbers!
Dev: Yeah... It's a numeric field, that's expected
(After several minutes explaining the difference between numeric and text characters...)
Dev: Got it?
Colleague: Hmmm... Yes, but...
Colleague: Why does the text field allow numbers??
Dev: PLOP!
--
T-shirt: NaN