Mookie Betts was so excited about his go-ahead grand slam that he stumbled to first base

The Red Sox have looked nearly unstoppable during the nine-game winning streak they carried into play on Thursday, so when the Blue Jays took an early 2-0 lead on a homer by Teoscar Hernández, it was atypical for the hometown fans in Boston to see them trailing. That situation didn't take too long to change, though.
In the fourth, the Red Sox rallied for five runs off J.A. Happ, capped by a 13-pitch battle with Mookie Betts that ended in a game-changing grand slam. The Fenway Park crowd went into a frenzy, and so did Betts.
The superstar was so excited, in fact, that he went from pumping up the crowd while going down the first-base line to nearly stumbling before he reached the bag:

You'll forgive Mookie for his exhilaration -- it was indeed a majestic slam. "Almost went down," he cracked to MLB.com's Ian Browne. "Had to depend on my athletic ability and it came through that time.
"Since I've been in the big leagues, that's probably the most excited I've been."
His teammates sure shared in it when they greeted him at home:

The Red Sox won the game, 6-4, to extend their winning streak to 10 in a row.
Rarely has a player's mood matched the crowd's emotions so perfectly.