EGO is the public transport authority for Ankara, operating the city's buses and metro services, and its validators announce different card types aloud when tapped. Serbest, meaning free or unrestricted in Turkish, is the response for cards with free travel entitlement, a sound commuters in the capital hear daily alongside paid and student fares. Clips of these validator announcements spread on Turkish social media and soundboards as in-jokes, with Serbest becoming shorthand for beleş, getting a ride or anything else without paying, especially among students and regular passengers.