There are a lot of things that can derail a teams pre-season preparations once the football starts up again.
A crushing 34-0 defeat in your new stadium can call into question a teams character while allowing your highly rated second choice Quarterback to have a horrendous game in week one can give you depth chart headaches.
The most common thing that hurts teams during pre-season is injuries and the Kansas City Chiefs may have suffered a damaging one.
Injury can occur to players off a strong hit, trying to turn to quickly or just going a bit too strenuously on a run.
But Chiefs Runningback Jamaal Charles - who missed Saturday's game against the Carolina Panthers where the Chiefs lost 28-16.
Why was Charles out? Well he was injured with a bruised foot, an injury that more than concerned every Chiefs fan.
Its not all bad news though, now that we know the x-rays have come back negative and that Charles is not seriously injured.
Now we can laugh at the story of how he bruised his foot, it turns out some cardboard boxes are to blame for one of the best Runningbacks in the NFL being hurt.
When the Chiefs broke training camp at Missouri Western State University last week, Charles was moving some boxes out of his dorm to the car park.
That journey was not a good idea as it turned out as he rolled his foot on a curb and was down with the bruised foot.
It is panic over for the Chiefs who are looking likely to have their star back for when the regular season kicks off in a few weeks and at least we all have a good story to laugh at.
Are the Chiefs ready?
It is the question that all NFL teams are asking themselves right now, are we ready for the season?
Can the Chiefs go better than their wildcard round exit in last year's play-offs?
Well for that we'll have to find out in January, but the question of their pre-season is right now, one that still poses a mystery.
As one of the 1-1 teams in pre-season this year, they have been strong on home turf beating the Cincinnati Bengals 41-39 but their away defeat to Carolina put a blemish on their record.
Who knows how their remaining games will go but they now have two weeks left of pre-season to get Charles some game time and then it all starts again.