Likewise to the misunderstandings about the people that practice Buddhism, there are several prevalent misunderstandings about Buddhism- and the Buddha himself.
Here are a few:
Buddha was . . .
a big, fat, jolly guy
the only one
enlightened when he starved himself almost to death.
Buddhism teaches that . . .
everything in life is suffering, and therefore has a very pessimistic view.
you must give away all your possessions.
your soul will be reincarnated.
everyone is punished by their karma.
enlightenment is being blissed out 24/7.
I know there are more out there. What have you encountered?