Along with all the other things said, I'd say tapping into your inner rage. Right before your lift, event, competition, etc., being able to flip the switch on while maintaining a level of control can take performance to another level.
Now I'm not talking about blind anger, but a positive, productive rage. Or as my dad has always said: "Sometimes you just have to be mean with it."
"...I have found the Iron to be my greatest friend. It never freaks out on me, never runs. Friends may come and go. But two hundred pounds is always two hundred pounds." - Henry Rollins