Well, can't get enough of it,
I remember another test from an old gym teacher. We went with whole class swimming and he lined us up at the edge of the swimming pool, all next to each other and facing the water. Then he came behind us and pushed us one by one into the swimming pool.
He noted down with which foot we landed first into the water.
For more than 90% of the persons this corresponded with the preferred foot to take off for e.g. the long jump. Again, it's independant from the fact wether you're left-handed or right-handed.
It's a brain thing. It reacts in a split second and gives preference to a certain legg/foot.
It's that same foot that you prefer to have in front on a snowboard or surfboard.
For me it's my left foot, which means port tack.