Travis Kelce and Patrick Mahomes look in midseason form already ... 'cause the two just connected on a crazy behind the back pass.
The play happened just moments ago during the Lions vs Chiefs preseason game ... on third down with three yards to go, Mahomes scrambled to his right -- before flicking the ball toward his main receiving threat.
TK's able to get the first down and more ... ending up just inside the Lions' 25-year-line -- a nice little chunk of yardage from one of the weirdest plays we'll probably see this preseason.