Medieval towns celebrated Feasts of Fools with music, masks, and playful reversals of social roles.

Many of the old empires were built on fools' paradises that collapsed when reality intervened.

Although outsiders dismissed them as motley fools, the group solved the puzzle before anyone else.

History shows that fools to themselves often repeat the same mistakes.

When he stubbornly repeated the same mistake at sixty, his daughter sighed and muttered, "there's no fool like an old fool," under her breath.

We planned a harmless surprise for her on April Fools' Day to make everyone laugh.

We planned a harmless prank for All Fools' Day to make everyone laugh.

She does not suffer fools gladly, so meetings with unprepared interns are always brief.

Over the years, their April Fools' Days celebrations have become more elaborate and creative each spring.

All Fools' Days brought unexpected pranks to every town we visited last month.