Failure

 Failure is good!
 
Lifters sometimes train to failure. For maximal strength gains, occasionally attempting a lift you know you cannot perform challenges every muscle fiber and sets you up to successfully make that lift in the future.
 
Before you try this at home: you must be able to lower the weight with control. This is called a negative. And you must have a capable spotter, unlike the guy in the cartoon above.
 
Viewing failure as a goal is an attitude adjustment you can take outside the gym, too.
 
“Failure is the condiment that gives success its flavor.” ― Truman Capote