The biggest free agent signings rarely pan out; just ask the franchise formerly known as the Washington Redskins.Washington signed defensive tackle Albert Haynesworth to a seven-year, $100 million contract in the 2009 offseason.Haynesworth lasted only two seasons in WashingtonGettyTo this day, it remains the biggest flop of a signing in NFL history.After seven productive seasons with the Tennessee Titans, two All-Pros, and two Pro Bowls, Haynesworth hit free agency in 2009 as its biggest prize.While there were a few red flags attached to the massive defensive tackle, both on and off the field, Washington didn’t seem to mind, as they handed him a haul.They would quickly regret their decision.Haynesworth lasted only two seasons in the nation’s capital, playing in just 20 games and recording 6.5 sacks.From the moment Haynesworth arrived, he clashed with head coach Mike Shanahan and his coaching staff, was out of shape, and consistently gave minimal effort when he was on the field.He had been suspended by the team, failed a physical, and was simply nowhere near the player he was in Tennessee. It was a disaster of a signing for Washington. He made $32 million during his time with the team.Eventually they traded him to the New England Patriots in 2011, where he lasted only four months before being cut.The Tampa Bay Buccaneers picked him up off of waivers, where he appeared in seven games before being released in 2012.Haynesworth signed his monumental deal with Washington on February 27, 2009. Three years later, he was out of the NFL for good.Haynesworth is considered the biggest free agent bust in NFL historyHaynesworth stock was at an all-time high when he reached free agency in 2009GettySince then, Shanahan and Haynesworth have engaged in a war of words publicly over time.In 2013, the two big personalities came to a head, when Haynesworth trashed his former head coach during a radio appearance in Tennessee.“Great coach,” Haynesworth began. “Yeah, I mean, that’s what he came in with. The very first meeting, he came in saying I’m a great coach, I know how to win, I’ve won 25 championships.“I’m like, 25 championships? Then I go back and look, and I was like, you haven’t won a freaking playoff game since [John] Elway retired.“How come Elway comes back after Shanahan gets fired? Kind of weird. I mean, the guy is all me, me, me. Sorry to say that.” Shanahan didn’t hold back in his response. NFL's Greatest......Ranking the top 10......Quarterbacks of all-time – Can anyone better Tom Brady?Wide receivers of all-time – Does Randy Moss or Jerry Rice come out on top?Running backs of all-time – Stacking Jim Brown, Barry Sanders, Walter Payton, Emmitt Smith and moreTight ends of all-time – How does Travis Kelce compare?“Let me put it this way,” Shanahan said.“I want to say it the right way. The only people I really haven’t gotten along with as a head coach or assistant coach is someone that’s lazy, and No. 2, when someone is lazy and they may lack character or they’re lazy and they lack a passion for the game, those are really the only people I haven’t gotten along with.“When I take a look through my years at people who have been lazy or have lacked passion for the job, they don’t go into the next year, and when they do, they don’t last the next year.“You usually take the high road as much as you can, and I usually do. But he’s been talking quite a bit over the last couple years, so I thought I’d be honest and tell you how I feel.”There’s clearly no love lost between Shanahan and Haynesworth, and there probably aren’t too many fans of the defensive tackle in the D.C area either.