It is the curse of construction sites and roadworks - copping an eyeful of a "builder's bum" whenever a portly worker squats, bends or slouches.
Now a Frenchman claims to have the answer - and it's not a belt, or even a pair of properly-fitting jeans. It's a new design of briefs that leaves no behind behind.
Adrien Herve-Pellissier, 24, says his pants come with a huge elastic band around the waistline that will prevent the wearer pulling an unintentional moony, or "sourire de plombier" - "the builder's smile".
Speaking to the i, Herve-Pellissier said:
I'm not changing the world,� it's not like I've found a cure for Aids - just for the builder's crack.
A lot of people laugh when they hear about the underwear, but in a positive way. I get a lot of encouragement from all kinds of people: men, women, young and old.
Herve-Pellissier said he was inspired to create the pair of pants after spotting "a particularly bad example on the street in Rennes". They have been very well-received by both men and women, according to their creator.
The 24-year-old is already looking to expand his business from online and into shops, and is working on a female version too.
A French inventor also came up with sweet-smelling underwear for men in 2013.