Russell dove into the stands along the third base line in pursuit of a foul ball in the bottom of the second inning and proceeded to knock a Cardinals fan's nachos onto the field.
The nacho dude, some guy in Cards gear named Andrew Gudermuth, was later given a fresh tray of nachos by the Cardinals - then an inning later presented with yet another by Russell on the shortstop's way to the field.
Someone brought a plate of nachos to the dugout a little later, and Russell decided to make the delivery.
"Great effort", pitcher Jon Lester said.
The loss eliminated St. Louis from NL Central contention but did not have as negative of an impact on the Cardinals' wild-card hopes.
Javier Baez hit a three-run home run in the third inning, but left the game shortly after fouling a pitch off his left leg in the eighth inning.
Simply put, the Cubs (88-68) resembled last year's deep offense in dismantling rookie right-hander Luke Weaver (7-2), who came into the game with seven consecutive wins. I also caught your foul ball so that was cool.
Barry refusing to budge as EPL record beckons
Even when you play 500 games you think you're coming to the end of your career and you're not expecting to play many more games. Sanchez played the whole game, just as he did in last week's Europa League opener against Cologne, in which he scored.
Russell chased a foul ball into the stands, accidentally kicking the fan's tray full of nachos, sending them flying. The Chicago Cubs have won 22 straight games when scoring more than three runs.
Bryant has scored 110 runs and has hit 29 home runs in the season after winning the National League MVP award in 2016, and he's looking to keep his hot hitting going as a likely playoff berth approaches for the Cubs.
Bryant hit his 29th home run of the season in the second with two outs for a 5-0 Cubs lead.
Baez hit his first homer since September 13 with two outs, driving in Zobrist and Heyward in the third, giving Chicago an 8-1 advantage. The fan was also later seen taking selfies with other fans.
The Cubs haven't had this much fun in St. Louis since - well, pretty much ever.
Now the Cubs will send their ace to the mound as they look to finish off the Brewers, as Arrieta will take the hill for the second time since returning from a strained hamstring he suffered in a game earlier this month.