I was writing an email to one of my colleagues today, wanting to ask if they had tested something. I wrote:

"Hey - did you give the new functionality a good set of testes in production yet?"

This is why, when you take Keyboarding in grade school, they teach you to look at the paper (when I learned, we learned on actual typewriters) instead of they keyboard. The real problem isn't the error, it's the fact that my muscle memory is so strong that it's nearly impossible for me to prevent myself from hitting the Send sequence the instant I complete the email.