Robbie McNulty, 14, was shooting baskets in a park near his home in Cambridge, Mass., as he does most nights in the summer.

Earlier this week, rain made the court wet and no one wanted to come out and shoot with him, but that did not deter him from heading to the court. He went out there and shot all by himself, navigating the puddles and parking cones.

And then a man approached and asked if he could get some shots up too. That man — Boston Celtics point guard Isaiah Thomas, an NBA All-Star.

According to The Boston Globe, Thomas and his wife had just left back-to-school night.

“He was the only kid there,” Thomas told The Boston Globe. “So I’m like, ‘I’m just going to go get some shots up with him.’ When I walked over, he rebounded his own shot and turned around and I’m like, ‘Can I get a couple shots?’ And he stopped. He didn’t even say a word, like his eyes were so big. He just stopped and froze and I’m like, ‘Pass me the ball.’ ”

The session lasted about 10 minutes and they played a game called “shots and layups.”

“I was kind of just like dribbling with my mouth open and looking at him, maybe waiting for him to say something,” Robbie told The Globe. “He was like, ‘Can I shoot with you?’ And I’m thinking, ‘Can I shoot with you? Is this actually Isaiah Thomas?’ ”

When it was over, he texted his mom and then used a photo he posted on Instagram to show that yes, he had played with the Celtics’ All-Star.

“It was just so nice of him to come over and play with me,” Robbie said. “I bet he didn’t even think it would be that big of a deal to me, but for me, like, it’s crazy. He’s an NBA All-Star and he’s just looking at you and talking to you.”