An excerpt from a longer article you should read.
10,000 days ago, the Mets made one of their most famous trades in their franchise history. Or, if you’d rather, 10,000 days ago the Expos made one of their least fondly remembered deals.
On Dec. 10, 1984—exactly 10,000 days ago—the Expos traded future Hall of Famer Gary Carter to the Mets. In exchange, Montreal received four players who collectively were not nearly as good as Carter.
The biggest name was Hubie Brooks. He’d been a quality Mets infielder for the past several years. Only 28 years old, he’d still have several more good seasons in front of him. Ultimately, his best seasons were in Canada. He’d be the most productive player Montreal received. So at least that part of the trade worked out for them.