Although we can practically set our watches to a lot of hits from the artists who top pop's upper echelons, the public's tastes can sometimes throw the music industry a curve ball.
For instance, if you predicted that "Old Town Road" wouldn't budge from the number one spot for over five months, you're the type of person I want to pick my lottery numbers.
But even when we consider that hits can come out of absolute nowhere from the people we least expect, it's still easy to be surprised with how things go.
After all, if Ed Sheeran had to guess who would beat him out on the album charts, it's doubtful that he would've guessed right.