I often tell my employees that I expected better of them, and give them tasks far beyond their capabilities. Knowing that if they have the drive/initiative to succeed that they will work triple the pace and push far beyond their own limits. Those who can't wash out quickly and save me the trouble of letting them build seniority.  I'm a bully in most senses of the word, but I reward them properly when they do well to compensate. My job requires taking a bunch of 19 year olds with no world experience and making them work at 150% the minimum, because our corporate is literally retarded in how they translate work to hours allowed.