Salary cap planning can be a nightmare.
Not only do you have to find a way to fit every player under the allotted yearly cap—$123 million in 2013—but you must also plan for future years, in which the growth of the salary cap is unknown.
In some cases, though, you can see the wrath of the salary cap coming a mile away. We haven't even started the 2013 season yet, and some teams might already be in a bind come 2014.
Whether it's a result of a spending spree this year, a few mistakes in year's past, too many restructured contracts or any combination of the above, these teams are going to have to pay the piper at some point.
All salary information courtesy of OverTheCap.com.