Jimmy Johnson really likes to go fishing. (Twitter)
Jimmy Johnson really likes to go fishing. (Twitter)

During the NFL offseason, Jimmy Johnson likes to do things: Not wear a shirt and fish -- and the former Dallas Cowboys coach managed to do both of those things on Friday. 

While fishing with his son, Johnson almost caught a blue marlin, but he didn't because his line broke before he got the giant fish back to his boat.

Now, we'll never know for sure how big the marlin was, but we know it had to be huge because well, just look at the tweet and picture below. 

So basically, Johnson and his son almost caught a blue marlin that might have been half blue whale. Also, please notice that Jimmy fishes so much that he had a sign specifically made for people who want to take pictures on his boat after catching a big fish. 

Anyway, Johnson is an avid fisherman who caught some mahi-mahi while fishing with Ohio State coach Urban Meyer last summer. I'm guessing Johnson will be going on a few more fishing trips before he returns to his job on Fox NFL Sunday in the fall.