About 300 professional clowns in Mexico say they hope their 15-minute non-stop laugh-a-thon will make a contribution to world peace.
The clowns from Mexico and Central America are in Mexico City for a four-day convention to trade jokes and hone skills like making balloon figures.
They gathered Wednesday at Mexico City's Mother's Monument under the slogan "Clowns For Peace, A World Without Violence."
They posed for a group picture and then set about laughing, tee-heeing and guffawing for about 15 minutes, on the premise that a world with more laughter will have less time or appetite for violence.
The demonstration comes amid continuing violence in Mexico's drug war.