The jab. Best you've seen? Current best?

[Beanflicker]

I think Roy Jones did not use it much because it makes you predictable and you can time a counter punch to it. That is the only disadvantage I can think of a jab, which is why you should vary the speed, intensity and target when using it.

Best example of that

https://www.youtube.com/watch?v=NGIUQ1mcZ_U