Malicious comments towards groups you don't like. The station manager. The faculty advisor. The president of the university. Every time I speak over the air.
Listeners know what station they're hearing.
At half-past the hour. Within five minutes of the top of the hour. Immediately shut down the station. Don't look at it, but staple it to the transmitter log. Announce it if it's not a test, and staple it to the transmitter log.