Justin Bieber throws out the ceremonial first eephus pitch before the White Sox game at U.S. Cellular Field on May 3, 2010.
An Eephus pitch (also spelled Ephus) in baseball is a very low speed junk pitch. The delivery from the pitcher has very low velocity and usually catches the hitter off-guard.
The Eephus pitch is thrown overhand like most pitches, but is characterized by an unusual, high arcing trajectory with a peak around 20–25 feet. (Wikipedia)
Ted Williams hit a three-run homer off the ''eephus,'' an arching blooper pitch, thrown by Rip Sewell, that reached a height of 25 feet before coming straight down toward the plate. Read more