But if they move too slowly, frustration among their own people could play havoc with their leisurely timetable.

ECONOMIST: Your move

Too much food or alcohol, especially late at night, just before bedtime, can play havoc with sleep patterns.

BBC: Alcohol-fuelled sleep 'less satisfying'

Harder to deal with are sand storms that play havoc with skate bearings.

WSJ: As the World Turns, So Do the Wheels of Roller Derby

The nuclear shutdown plus the caprices of wind and sun could play havoc with electricity supplies unless new infrastructure is built quickly, warn the power companies.

ECONOMIST: Germany��s coalition

After the first Test, although the visitors dominated most of the match, the last day in Cardiff seemed to play havoc with the psyche of the young Australians.

BBC: Justin Langer column

The weather still could play havoc with the series, too.

WSJ: Mets-Rockies game postponed by spring snowstorm

Long drives just a fraction off skitter through the turns and into the Bermuda rough, which is not long enough to prevent advancing the ball but is certainly long enough to create low-spinning fliers and play havoc with distance control.

WSJ: Players Championship: The Major That Isn't Yet Major

But with the rain playing havoc with the playing schedule, organizers announced that play would begin early Sunday with the tournament reduced to 54-holes.

CNN: Donald makes shock exit at Malaysia Open

Not the type children play with and people write songs about, but the kind that when they burst, usually cause financial havoc.

FORBES: It Started With Tulips, Now Bubble-Watchers Are Looking To The Bond Market