11.   Sometimes plain old fun is the motivation.

12.   Some acting duos are just plain fun to watch, period.

13.   The movie may have desired to be plain old dumb fun.

14.   The Pinnacles are also just plain fun to look at for all ages, like a trip back to the dinosaur age.

15.   There are other kinds of historical and literary sites, nautical attractions and places that are just plain fun.

16.   This venue is just plain fun.

17.   While there is enough practical information to suit the most dour Web surfer, there also are plenty of light features that are just plain fun.

18.   All that makes the back nine on Sunday at The Players Championship just plain fun to watch.

19.   But then there was just plain fun, too.

20.   It provides vast amount of information and resources that can be used for educational purposes or just plain old fun.