If it had been a different Arthur he may have been able to appreciate that Merlin's neckerchief was simply his equivalent of a towel. (Or, a collection of shorts exhibiting the many uses of a certain warlock's neck wear. No Slash)

My take on Azula's encounter with the mirror.

Gaius tends to Merlin as he recovers from a concussion. Complete fluff, serves as a sort of deleted scene for 'Patient Zero' but stands alone well enough.