Be you warned, for here there be .gifs.
That's 16 inches of 12-6 break that would look terrific against lefties and righties alike. Whether Jakubauskas is a nobody stopgap or someone we'll have to take seriously - a lot of it comes down to his command of this pitch. Learn to spot that thing and we could be talking about some kind of late-blooming, right-handed Wandy Rodriguez.
Ye gods, that's fun to watch.