One of the highlights of the seder is when the youngest person in attendance
recites the "Four Questions," four observations about the differences
between Passover and other days: 1) we eat matzah instead of bread, 2) we eat bitter vegetables, 3) we dip our vegetables twice, and 4) we recline instead of sitting up straight. Obviously, this child has been to the seder before, because we haven't eaten bitter vegetables yet (although they are on the table), and we've only dipped once so far!