Ain't nothing. You should see what knuckleball does to the senses..
EXACTLY, Don! Wasn't going to say it, but back in the day (yeah, before dirt was born), I could hit a curveball. The two pitches I could NOT hit were a hard slider that made me think it was a fastball at my shoulder and a
knuckleball. (Don't recall anyone throwing splitters back then, but I probably couldn't have hit those either -- the same as with riseballs in softball years later.)
I had a team mate (Ed Malec) my first year in Pony League who was 2 years older than me -- a lefty with great fastball, curve, etc., and the occasional no-hitter. Then when I played JV HS in 10th grade, he was varsity and had developed 3 different knuckleballs (I believe he held them differently, but they definitely broke differently). A couple times a week, we'd play intramural games with the varsity, and Ed made me look stupid every AB. I used to curse and dare him to throw something else. I recall grounding out once, and other than that fouled a couple or three off. Those were the only times I ever faced a pitcher who could actually throw one right and make it do what it do.
Jittering almost all the way to the plate, it owned my a$$ even before it did that breaking sh&t out in front of the plate -- I mean, you KNOW what it is tens of feet before it gets to the plate, and that's a big part of the problem. After I had no success lunging and waving at it, I got to the point where I just swung through the general area it seemed to be heading. The extent of my success at that was the above-mentioned foul balls. The weak ground out was on a fastball, which also owned me because I was so consumed anticipating a knuckleball every pitch. I was kinda surprised I never heard of him making it in baseball; another HS team mate played 20+ years in the majors -- all but a couple in RF in Fenway.