Joe Horn, WR
Back in the 1996 NFL Draft, the Chiefs took a flyer on a young wide receiver who'd taken a rather circuitous route to land on the NFL's doorstep. With their fifth-round pick, which was No. 135 overall, the Chiefs let him in.
Joe Horn was the Chiefs' fifth-round choice that year, a talented young wideout who went from community colleges to the CFL only to blow up for a Memphis expansion franchise (yep, CFL in America) to the tune of over 1,400 yards.
Unfortunately for the Chiefs, Horn qualifies as a draft steal in a general sense but not for the franchise itself. The Chiefs restrained Horn on the depth chart and relegated him to special teams only to lose him to the New Orleans Saints in free agency after his rookie deal was up following his fourth season in the league. With the Saints, however, Horn became a perennial Pro Bowler.
By the end of his career, Horn would haul in over 600 passes for 8,700 receiving yards and 58 touchdowns in a career that didn't even begin until he was 24 (nor did he even take off until he was 28). If Horn had gotten an NFL chance early like most players, he could have conceivably been a Hall of Fame talent. As it is, he's a member of the Saints HOF. That's a nice grab in the fifth round.