Her dream of competing in the Olympics became a 'reality'. [=she competed in the Olympics, as she had dreamed of doing]
He was starting to think he was infallible, so the criticism from his boss served as a 'reality check'.
Her friends gave her a 'reality check' about her boyfriend. [=told her the truth about her boyfriend]
(..) Okay, "Kim". Shut him down. "Alex." You can't run from this. You have to understand the reality of the situation. Show me. "Kim." No. Holy Christ. Holy Christ! (..)2014 RoboCop