Jack of all trades, master of none.
Miss HR was a cool girl.
I met her at a previous work place, a tiny consulting firm that no longer exists, and we immediately hit it off. Whenever I was in between projects, she proposed to my manager that I attend college job fairs with her.
I wasn't qualified to hire anyone, of course, but Miss HR liked my company, and Mr. Manager liked the exposure his department was going to receive. So I went, and had a good time with Miss HR.
During one of the job fairs...
...a young man, all dressed up and looking important, came to talk to us. According to him, he was THE-MAN: master psychologist, astute manager, genius engineer, communications expert...I don't remember everything, because it was a looooooooooong list.
"Check out this guy!" I exclaimed, "he's so smart!"
Miss HR, who was much savvier than I was, looked rather unimpressed. She leaned over and whispered, "Jack of all trades, master of none."