One out of every 4 million lobsters is born with a rare genetic defect that turns the lobster blue.
Until the mid-1800s, lobster was considered a terrible, low-class food. It was frequently served to prison inmates, and servants often had conditions in their employment contracts stating that they refused to eat lobster more than twice a week. Some states even had laws against serving lobsters to prisoners more than a few times per week, since it was considered a cruel punishment, similar to being forced to eat rats.
Lobsters are functionally immortal. They show no measurable signs of aging (no loss of appetite, no change in metabolism, no loss of reproductive urge or ability, no decline in strength or health), and seem to only die from external causes. The bigger they are the older they are.