The Secret of My Success (PG-13)
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This came out in 1987, and I'm sure I saw it once, probably in the late 80s (when I feel like I would have been too young to watch it, but whatevs). I watched it again in 2023 to write a review. And... I dunno, I guess it's not really bad, but I didn't really care for it much, either.

Michael J. Fox plays a Kansas farm boy named Brantley Foster, who, after college, moves to New York City. He gets a crappy apartment, and the job he had lined up immediately falls through, so he starts looking for work elsewhere. Not having any luck, he finally tries contacting a distant relative he doesn't even know, Howard Prescott, the CEO of Pemrose Corporation. His "uncle" gives him a job in the mailroom, where Brantley befriends a coworker named Fred Melrose (John Pankow, whom I know from Mad About You). He also develops an infatuation with an executive named Christy Wills (Helen Slater). One day, Prescott's wife, Vera, seduces Brantley (though at the time he doesn't know she's his uncle's wife). Another day, Brantley decides to start living a double life at Pemrose, inventing a newly hired executive named Carlton Whitfield, while still also working in the mailroom as himself. He eventually gets involved with Christy, whom Prescott has been dating behind Vera's back. Prescott, who doesn't meet "Whitfield" and has no idea it's actually his nephew, becomes concerned that the new guy may be a plant sent by some other businessman to help pave the way for a hostile takeover of the company, and he wants Christy to get closer to Whitfield to spy on him.

Well, the whole thing becomes a comedy of errors, but not one I found particularly funny. I don't want to reveal any more of the plot, but there is what I guess you'd call a happy ending.