What happened: The Boston Celtics marked a birthday with a lighthearted, joking nod to a headlock-style greeting. The team leaned into the playful moment as part of its offseason social presence.

Why it matters: Offseason moments like this keep a contending roster's culture visible to fans during a quiet stretch of the calendar. With training and roster work ramping toward the 2026-27 campaign, the Celtics are keeping their identity front and center.

What to watch: Attention will turn back to on-court business as Boston builds toward the 2026-27 season.