There are also cases when you should not be wearing a seatbelt -- if you have just got on a plane and it's still being refilled the seatbelt sign is off and som

There are also cases when you should not be wearing a seatbelt -- if you have just got on a plane and it's still being refilled the seatbelt sign is off and sometimes the crew will tell you not to put your seatbelt on while it's being refilled.