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]
(..) You'd like me to breastfeed him? Walter, just bring him home. Introduce him to Emily and Michael, And once... once he comes to Terms with reality, He should drop the whole elf Thing and move on with his life. I mean, that's what I would do if I was you. Oh, my god! Walter, this is... (..)2003 Elf