This has got to be the funniest paragraph I've ever come across on Wikipedia.

Care should always be exercised when registering a domain name: DNS is case-insensitive and the modern trend of words run together with intercapping can be misinterpreted when converted to lowercase. Who Represents, a database of artists and agents, chose whorepresents.com; a therapists' network thought therapistfinder.com looked good; Experts Exchange, the programmers' site, for a long time had expertsexchange.com; Another website operating as of October, 2006, is penisland.com, a website for Pen Island, an online pen vendor.

--from http://en.wikipedia.org/wiki/Domain_name