Once, I heard a DJ say on-air after playing Henry Mancini's "Mr. Lucky," "I guess you could say I feel like Mr. Lucky today." Casual listeners wouldn't have heard any subtext in that, but I did. I knew that the next DJ hadn't shown up yet and the DJ's unspoken message was, "Hey, next DJ, get here ASAP. I need to go to my other job, and I can't do that until you arrive."
A little later, I heard the next DJ admit on-air, "I didn't realize I was supposed to work today."