Step 1: Gather materials (socks, a friend, a spare pair of eyes)

Step 2: Discreetly swap the socks in question

Step 3: Maintain a poker face

Step 4: Enjoy the satisfaction of a perfectly executed substitution

Disclaimer: Substitution is not recommended. Or is it?

Please note that substitution can be a slippery slope, leading to a life of deceit and confusion. Proceed with caution.

Substitution Support Group