[whycome]

The fun part will be seeing how teams learn to game the system. The batter can call it, but I think it would be hard to stifle any kind of communication from the dugout.

/something higher tech than banging a garbage can obviously.

[carefulfungi]

It will be fun to see if teams prefer batters or catchers use the system. Or if they will coach either side to use it situationally. I think, so far, catchers have better challenge success rates?