How can I tell one from the other?

I have two pairs of multicolored socks.
Actually I have many more socks than that, but these are the pairs in question!

These socks are identical with the following exceptios: one pair has a blue stripe at the top of the left sock, and a red stripe on the right. The other pair is just the opposite, with a red stripe on the left and a blue stripe on the right. Any suggestions as to make sure I have the correct socks on the correct feet?

Humor encouraged!