Why? Well, you might find yourself in this poor girl’s position.

Footage caught on a mobile phone shows the moment the girl’s trousers started lowering as she struggled to cling on to a particularly vigorous ride.

Not only that, but she wasn’t wearing any knickers.

Her boyfriend desperately tried to protect her modesty as they bounced around the La Tagada ride at Costa Rica’s Zapote Festival but to no avail.

Around them hundreds of spectators could be heard cheering, while the dirty pervert guy sitting next to them seemed to cop a good look.

Eventually the ride stopped and the girl was able to pull her trousers back up.

Girl goes commando on fairground ride, flashes EVERYONE