Lets say you start work at 9am. Call in at 11am, ask for your boss, and ask him if he can clock/sign you in as if you came in at 9am. Just say it real quick, thanks, and bye. Then show up at 2pm, stay there for half an hour, and tell everyone your going to lunch. Lets say you get off at 5pm. Come back from lunch at 4:15, stay for 5 minutes, and just don't clock/sign out. Tell your boss your leaving and to clock/sign you out at 8pm. Then don't show up tomorrow and do this every other day.