There are some threads you don’t want to tug — particularly when that thread is attached to some suspicious looking paraphernalia in your mother-in-law’s house.

One woman was left blushing and befuddled while cleaning out her in-law’s cupboards after stumbling across a bizarre, phallic object.

“OK, we found 2 of these doily thingies while cleaning out my MILs house,” she shared on Facebook, alongside a photo of an erect object that was covered in a red and pink crochet slip.

The increasingly mortified daughter-in-law continued, “Please tell me this is not what we think it is. There has to be an innocent use for them like a candlestick cozy or something??”

The puzzling images prompted hundreds of comments on Facebook over the weekend within the closed group Things Found in Walls — And Other Hidden Findings, which boasts over 534,000 members.

“I feel like MIL had some adventures,” one follower suggested.

Joked another, “It’s a Phallus Flower. Dating back to the Victorian era. They were worn by the upper class men during their dressing with the valet, to provide modesty.”

“Sometimes a guy just likes to feel fancy,” one follower claimed.

Someone also said they believed the erotic whatchamacallit could be “an early day failed attempt at a condom.”

Despite the array of the X-rated comments, the answer was wholly G-rated.

Said one Facebook user, “My grandma used to have one” — as others also recognized it as an old-fashioned dressing for floral bouquet stems.