Shampoo Challenge

Also known as: ShampooChallenge, シャンプーチャレンジ

A real-life photo challenge where a man is shown balancing a Shampoo Bottle on their Bulge. While the challenge is similar to common Penis length comparisons with items such as soda cans or pipes, it instead measures how sturdy the in-underwear Erection is to properly carry a small item.

See also

• Tawawa Challenge
• Bubble Tea Challenge