It's a feeling of uncertainty, but not just any uncertainty. No, no. This is the uncertainty that comes with wearing a single sock.
Is it clean? Has it been worn by someone with athlete's foot? Does it even match the other sock I'm wearing?
These questions plague us all, and for good reason.
But fear not! For there are ways to overcome this Sock of Doubt:
Or, if you'd rather not confront your Sock of Doubt, you could just go to What is a Sock-Solution and see what other people are doing about it.