At the Los Angeles Angels of Anaheim versus Toronto Blue Jays game on June 30, 2018. In baseball parlance a "changeup" is a pitch intended to fool the batter into thinking a fastball is on the way, when in fact the pitch thrown is much slower. The ruse is based on the pitcher's motion which is intended to emulate his fastball motion. If successful the batter will think a fastball's coming and will swing far too soon. The fact that the ball is even visible in this photo suggests to that it was an off-speed pitch; i.e., something slower than a fastball, such as a curveball, a slider or, as I think was the case here, a changeup. Olympus OM2n with Kodak Tri-X 400 film processed in Cinestill DF76 Monobath and scanned on an Epson V500.