This is going to vary depending on our favourite sports, of course, and I think that's great.
Growing up in Canada in the '80s, it was hard for a kid not to be awed by NHL hockey legend Wayne Gretzky, who would become known as the Great One. I even had a Wayne Gretzky lunch pail.
Anyway, he played a game where, in one season, scoring 20 to 30 goals makes you a "goal scorer," 50 goals makes you a "sharpshooter," and 100 points makes you a top player in the league. Gretzky, in his best years, scored 92 goals in one season and 215 points (52 goals, 163 assists) in another. Yet, even after such record-breaking feats, he still had one milestone ahead of him: legend (and Gretzky's idol) Gordie Howe's long-standing record of 1,850 total career points.
Well, it didn't take him long. He managed to break Howe's record in about 1/3 of the time (and against his former team, the Edmonton Oilers), and would go on to score more than 1,000 more in his career. It will be a long time before many of Gretzky's records are broken...if they ever will be--they are that astounding.
Wayne Gretzky's Record-breaking 1,851st Career Point
Los Angeles Kings vs. Edmonton Oilers
October 15, 1990