If the action couldn’t happen on screen then it surely could happen off screen. This odd, made-in-Denmark controller was called the Terminator and was shaped like a very realistic grenade – complete with pin.
I remember the old style “stick” controllers with the triangular head so I guess this is similar. You’d hold this in your hand and move the top with your thumb. Sadly you’d also probably look like you were ready to blow up the computer lab, a sad side effect of these frightened times.