You were acting in a scene with Randolph, who plays as John Gage in emergency!, you play as Enid sardith.

You turned to look at Randolph in character for the scene, when Randolph comes running in, but the soles of his paramedic shoes, didn't have that much grip on the newly polished floors, causing him to trip and fall to the ground.

And the directors had caught the moment on camera, while you bursted out into a fit of laughter.