a shot of life
A human or object that brings the energy, the noise, and the kind of vibe that makes you feel like you're at a concert, even if you're just sitting in your living room.
My friend started a dance-off with my brother. That was a shot of life.
My mom screamed at the TV for showing bad news. That was a shot of life.
My dog tried to open the fridge. That was a shot of life.