JaMarcus Russell, the No. 1 overall pick in the 2007 NFL draft who hasn't played since 2009, said he will "play for free" if a team gives him another chance. - http://espn.go.com/nfl/story/_/id/15384038/jamarcus-russell-says-play-free-just-wants-another-chance
This would be a typical Popp signing.
If Russell is semi-serious about "for free" the contract could be for low dollars. This guy had ALL the physical tools, so if he happens (Lotto 6/49-ish probability) to have his head together and his dedication "back" (don't know that he ever had it) it would be a home run, and if not it is just peek under the hood to check the engine.