In ham radio, to make a random contact you call CQ (think of I SEEK YOU), and when you make contact with another operator it's called a QSO ("I can communicate directly."). A big part of the fun in ham radio is seeing how many contacts you can make. Some operators will mail out QSL ("I acknowledge communication.") cards to document the contact, including the ISS if you're lucky enough to get them on their free time. 

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My goal is to hop on my radio or EchoLink at least once a day and call CQ to talk to random ham operators around the world. Below is my log of contacts.