On Earth, the brace position is a recommended position for aircraft passengers to take if the aircraft is headed for a dangerous landing. It involves being seated and bending forward at the waist as far as possible with the chin tucked against the chest.
When Moya was coming in for a landing on Denea, Pilot pointed out that Leviathans didn't land on planets, and John Crichton responded by saying, "We can stick our heads between our legs and kiss our asses good-bye." ("I, E.T.")