Take turns switching off your camera and find something nearby to make a noise (If you can’t turn off your camera, move away from the screen or tilt the camera upwards so nobody can see).
Everybody else, once the noise has been made a few times, take turns guessing what you think it could be.
Once everyone’s guessed, turn your camera back on and show them. Did anyone guess correctly?
Example: you could scrunch up a piece of paper, spin a coin or play a musical instrument. Or even make a funny animal noise.