Moments before being left in charge of the four-flavor Freez-King shake machine at the Folsom Boulevard Arby's Monday, recent hire Felicia Alexander was told to have fun. 'Knock yourself out,' shift manager Barry Rundell said to Alexander at the beginning of lunch rush. 'Just remember to give the Jamocha lever a little wiggle if it gets stuck. Other than that, bombs away.' Rundell has previously instructed trainees to 'go nuts' at the deep fryer, 'indulge yourself' mopping spilled soda off the floor in the dining area, and 'have a gay springtime carnival' wiping vomit off the seat of the men's-room toilet. 