Ah! But are you sure they actually go INTO the washing machine or dryer? I don't have a dryer, or at least I do - it's the solar powered one out in the garden. And when hanging them up out there, I put them on the line in matched pairs, so I know if they all came out of the washing machine. The socks generally get into the washing basket in pairs or close proximity to each other, so I know they get IN in pairs. My son's socks are the most likely to lose one of a pair and that's because they don't always go into the washing basket as a pair.