What are the special coins?

Also, what is "hijacking" a thread?

Hello! The special coins can be used in the Coin Machine in the Lower West Side area of Centropolis. They give out random prizes. Hijacking a thread is taking over a thread that isn't yours and is generally frowned upon.

Special coins can be used in the Coin Machine in the Lower West Side of Centropolis for prizes. Hijacking a thread is basically just going onto a thread, and asking your own question there or changing the subject. Like if I were to start asking questions that have nothing really to do with what you've asked, for example, that would be hijacking the thread.

Edited for clarification.

Oh alright, thank you!