ARVADA, Colo., June 1 (UPI) -- Two robbery suspects who allegedly committed their crimes wearing thongs on their heads are being sought in Arvada, Colo., police say.

Police spokeswoman Susan Medina said while wearing underwear on their heads may make the suspects the walking butt of a joke, their actions are no laughing matter, Denver's KWGN-TV reported Friday.

"You see these two guys wearing, basically, panties over their heads to disguise themselves," Medina said, referring to a surveillance video of the two men. "But the bottom line is: this is a serious crime."

The two men allegedly broke through the glass door of a convenience store May 16, hitting and robbing the clerk.

Medina told the TV station the suspects' motivation in choosing thongs for a disguise was questionable given the underwear's scant nature.

"There's a plethora of disguises out there: ski masks, character costumes," Medina said. "And, if you're going to wear underwear, certainly there are other kinds that would give you a little more coverage."