Guess Dərpy loves derping herself. Dərpy word filers to have an upside down e and a capital D. So if you spelt Dərpy in all lowercase, the e flips and the D gets bigger.
Interestingly it affects linking to pony news site Dərpy Hooves News. For example, this...
http://www.Dərpyhoovesnews.com/friendship-is-magic-season-4-to-begin-in-winter-2013-reports-ew/ Click it, because the "e" is flipped, the link will not work at all. Fix the "e" and it Still won't work (Pinkieshy pointed out changing the "e" didn't work). When I retyped the "d" and "r" as well, it worked.
Understandable for Dərpy, but maybe it could be fixed for links.
Already done, as mentioned in Fluttershenanigans thread. <3