The real reason Phil Coulson is so competent and unflappable isn’t just training and hard work: he’s actually stuck in an elogated Groundhog Day-style loop several iterations in.
The actual point of restart is slightly before the first Iron Man movie (which is why he was so conveniently waiting for Pepper right as she was leaving Stane’s office) and the current canon is the most recent iteration.
He amuses himself each iteration by taking out the burglars at the gas station in a different way. They haven’t gotten away once.
It took him a quite a few times to figure out how to nudge Thor into being “worthy.” Giving him a wrong to right by taking Jane’s science equipment (and Darcy’s iPod, even though he knows exactly how much of a grudge she’ll hold) and letting Loki (who has never heard of a security camera) talk to Thor and all of that. Once or twice he tried to just shoot Loki when he showed up, but that always ended badly.
In the second Iron Man movie, he obviously didn’t have much patience for Tony’s woe-is-me antics after the fourth or fifth time he had to put up with them. In a couple iterations Tony did discover the new element to fix the reactor but the palladium poisoning was too far gone to cure, so making Tony FOCUS was a big priority to him.
Fury knows about the cycle, of course. He finds it mildly annoying how Phil always has a perfect comeback to everything he says as a result. Fury first same up with the idea of Phil faking his death, but Phil has claimed credit for it ever since.
Phil was seriously tempted to start again with a new iteration the first time he found out Fury bloodied up his Captain America cards, but Fury eventually convinced him it was necessary.
And yet, no matter how many times he goes through it, he still can’t seem to keep himself from looking like a moron in front of Captain America.
Submitted by anon