This note illustrates that a combination of the approach in our previous papers (Boucherie and Boxma, 1996, Probability in the Engineering and Informational Sciences 10: 261-277; Jain and Sigman, 1996, Probability in the Engineering and Informational Sciences I 0: 519-531) directly leads to a Pollaczek-Khintchine form for the workload in a queue with negative customers. The same technique is also applied to risk processes with lump additions.