✕Rabbi Akiva's sukkah
Rabban Gamliel and Rabbi Akiva were sailing on a ship. Rabbi Akiva built a sukkah on the deck, and the next day the wind blew it away. Rabban Gamliel asked him, “Akiva, where is your sukkah?” — Sukkah 23a. The halacha follows Rabbi Akiva: a sukkah on a ship or a wagon is kosher, as long as it could stand in an ordinary wind on land.