You want to talk about Archer?
One of his first first contacts, he transmits coordinates to Earth to some bug eyed baddies before he's completely finished saying hello to prove that they are friendly and doe eyed with no aggressive intentions, which is when the bug eyes started shooting at him, with probably plans to sell most of his crew into slavery who they didn't think would blend well into Friday night's casserole.
Oh! OH! OH!
What about Harriman?
First day on the job and he kills Kirk.