well i was working on a power system for a space ship me and a friend were working on and we came up with using pong projectiles and tubes, heres the result :D
overall picture:

the counter (spawns the first pong ball):

the Nuclear pong Friction generator (N.P.F.G(sends relays to the counter and when the counter overflows the first pong ball is spawned)):

and lastly the lights that light up when the projectile hits a brick:

Rate if you really want i couldnt care less :V (by the by this wasnt a 5 minute project, getting the events right was sorta difficult and took up and hour of my time to think about how it would work D:)