Professional trainers should use humor to help their classes learn new information. Trainees usually react to humor because they are expecting the trainer to be serious. Humor is particularly useful when trainers are presenting difficult or technical information. Trainers should not try to salvage a joke if nobody laughs; they should go on as if nothing happened. Listeners appreciate jokes that appear spontaneous more than they appreciate planned jokes. Trainers can appear to be spontaneous even if they are not by finding out about the company's gossip and referring to it during the lecture and planning what to say in advance if distractions occur during the presentation.