Once a certain number of batting players are out (different in the two sports), the teams swap roles.

The leaders' plan to swap roles has not affected their popularity.

Men and women have swapped roles for centuries.

Yet as they mature and their circumstances change, they find themselves swapping roles.

Players then swap roles, and the one who takes more money is declared the winner.

During the season, they also played the trick on the show when the show's models swapped roles with the host and announcer.

Once the time is up, the teams must swap roles.

Our relationship hasn't been the same since we swapped roles, but then that may also because we have a three year old and now another one.

Sometimes, however, they swap roles as Marlon tries to play it cool.

In each pair, the experimenter and subject swapped roles.