Ah, this is cute. I'm sure you are familiar with what the Droga5 logo looks like, where the 5 replaces the G. It's so fancy.
Well, for someone a little less experienced in advertising, they might assume that's how it's actually spelled, and type in http://dro5a.com when attempting to visit or email the agency. Sending off emails to email@example.com and firstname.lastname@example.org in the hopes of establishing a work relationship, perhaps.
But then you will have been hijacked by Mother London, because they own that URL and are getting all your traffic and seeing all your emails. Smartarses.