Why did the unlucky athlete bring a ladder to the game? Because they wanted to take a *chance injury* to a whole new level!

And that’s why this pun is fun: This pun twists the phrase “chance injury” by humorously imagining an athlete ‘taking it to a new level’ literally with a ladder. It’s funny because it plays on the double meaning of ‘chance’ as both opportunity and risk, combined with ‘injury’ in sports context.